Merge branch 'duckietm:Dev' into Dev

public/configuration/UITexts_en.json5.example

@@ -707,6 +707,24 @@
     'chatcmd.client.info':        'Client info',
 
     // ------------------------------------------------------------------------
+    // Mentions
+    // ------------------------------------------------------------------------
+    'mentions.window.title':    'Mentions',
+    'mentions.window.empty':    'No mentions',
+    'mentions.window.markall':  'Mark all as read',
+    'mentions.tab.title':       'Mentions',
+    'mentions.notification':    '%sender% mentioned you in %room%',
+    'mentions.filter.all':      'All',
+    'mentions.filter.unread':   'Unread',
+    'mentions.filter.direct':   'Direct',
+    'mentions.filter.room':     'Room',
+    'mentions.group.today':     'Today',
+    'mentions.group.yesterday': 'Yesterday',
+    'mentions.group.older':     'Earlier',
+    'mentions.type.direct':     'Direct mention',
+    'mentions.type.room':       'Room mention',
+    'mentions.action.goto':     'Go to room',
+    'mentions.action.remove':   'Remove',
     // Me-menu settings + User account settings window
     // ------------------------------------------------------------------------
     'usersettings.tab.general':                         "General",

public/configuration/UITexts_it.json5.example

@@ -707,6 +707,24 @@
     'chatcmd.client.info':        'Info client',
 
     // ------------------------------------------------------------------------
+    // Mentions
+    // ------------------------------------------------------------------------
+    'mentions.window.title':    'Menzioni',
+    'mentions.window.empty':    'Nessuna menzione',
+    'mentions.window.markall':  'Segna tutte come lette',
+    'mentions.tab.title':       'Menzioni',
+    'mentions.notification':    '%sender% ti ha menzionato in %room%',
+    'mentions.filter.all':      'Tutte',
+    'mentions.filter.unread':   'Non lette',
+    'mentions.filter.direct':   'Dirette',
+    'mentions.filter.room':     'Stanza',
+    'mentions.group.today':     'Oggi',
+    'mentions.group.yesterday': 'Ieri',
+    'mentions.group.older':     'Precedenti',
+    'mentions.type.direct':     'Menzione diretta',
+    'mentions.type.room':       'Menzione di stanza',
+    'mentions.action.goto':     'Vai alla stanza',
+    'mentions.action.remove':   'Rimuovi',
     // Me-menu settings + User account settings window
     // ------------------------------------------------------------------------
     'usersettings.tab.general':                         "Generale",

public/configuration/UITexts_nl.json5.example

@@ -709,6 +709,24 @@
     'chatcmd.client.info':        'Client info',
 
     // ------------------------------------------------------------------------
+    // Mentions
+    // ------------------------------------------------------------------------
+    'mentions.window.title':    'Vermeldingen',
+    'mentions.window.empty':    'Geen vermeldingen',
+    'mentions.window.markall':  'Alles als gelezen markeren',
+    'mentions.tab.title':       'Vermeldingen',
+    'mentions.notification':    '%sender% heeft je genoemd in %room%',
+    'mentions.filter.all':      'Alle',
+    'mentions.filter.unread':   'Ongelezen',
+    'mentions.filter.direct':   'Direct',
+    'mentions.filter.room':     'Kamer',
+    'mentions.group.today':     'Vandaag',
+    'mentions.group.yesterday': 'Gisteren',
+    'mentions.group.older':     'Eerder',
+    'mentions.type.direct':     'Directe vermelding',
+    'mentions.type.room':       'Kamervermelding',
+    'mentions.action.goto':     'Ga naar kamer',
+    'mentions.action.remove':   'Verwijderen',
     // Me-menu settings + User account settings window
     // ------------------------------------------------------------------------
     'usersettings.tab.general':                         "Algemeen",

public/configuration/ui-config.example

@@ -25,6 +25,8 @@
     "wired.action.mute.user.max.length": 100,
     "game.center.enabled": false,
     "radio_ui.enabled": false,
+    "mentions_ui.enabled": true,
+    "mentions_ui.sound": true,
     "guides.enabled": true,
 	"housekeeping.enabled": true,
     "toolbar.hide.quests": true,

src/api/index.ts

@@ -17,6 +17,7 @@ export * from './hc-center';
 export * from './help';
 export * from './housekeeping';
 export * from './inventory';
+export * from './mentions';
 export * from './mod-tools';
 export * from './navigator';
 export * from './nitro';

src/api/mentions/IMentionEntry.ts

@@ -0,0 +1,12 @@
+export interface IMentionEntry
+{
+    mentionId: number;
+    senderId: number;
+    senderUsername: string;
+    roomId: number;
+    roomName: string;
+    message: string;
+    mentionType: number;
+    timestamp: number;
+    read: boolean;
+}

src/api/mentions/MentionType.ts

@@ -0,0 +1,5 @@
+export class MentionType
+{
+    public static DIRECT: number = 0;
+    public static ROOM: number = 1;
+}

src/api/mentions/index.ts

@@ -0,0 +1,2 @@
+export * from './MentionType';
+export * from './IMentionEntry';

src/components/MainView.tsx

@@ -1,8 +1,9 @@
-import { AddLinkEventTracker, GetCommunication, GetRoomSessionManager, HabboWebTools, ILinkEventTracker, RemoveLinkEventTracker, RoomSessionEvent } from '@nitrots/nitro-renderer';
+import { AddLinkEventTracker, GetCommunication, GetRoomSessionManager, HabboWebTools, ILinkEventTracker, MarkMentionsReadComposer, RemoveLinkEventTracker, RoomSessionEvent } from '@nitrots/nitro-renderer';
 import { AnimatePresence, motion } from 'framer-motion';
 import { FC, useEffect, useState } from 'react';
-import { GetConfigurationValue } from '../api';
+import { GetConfigurationValue, SendMessageComposer } from '../api';
-import { useNitroEventReducer } from '../hooks';
+import { useMentionMessages, useNitroEventReducer } from '../hooks';
+import { markAllRead } from '../hooks/mentions/mentionsStore';
 import { AchievementsView } from './achievements/AchievementsView';
 import { AvatarEditorView } from './avatar-editor';
 import { BadgeCreatorView } from './badge-creator';
@@ -47,11 +48,15 @@ import { UserAccountSettingsView } from './user-settings/UserAccountSettingsView
 import { UserSettingsView } from './user-settings/UserSettingsView';
 import { WiredView } from './wired/WiredView';
 import { WiredCreatorToolsView } from './wired-tools/WiredCreatorToolsView';
+import { MentionsView } from './mentions';
 
 export const MainView: FC<{}> = props =>
 {
     const [ isReady, setIsReady ] = useState(false);
     const [ localizationVersion, setLocalizationVersion ] = useState(0);
+    const [ mentionsVisible, setMentionsVisible ] = useState(false);
+
+    useMentionMessages();
 
     // CREATED and ENDED can arrive out of order under flaky reconnects.
     // Treating them as two independent setters left landingViewVisible
@@ -124,6 +129,54 @@ export const MainView: FC<{}> = props =>
         return () => RemoveLinkEventTracker(linkTracker);
     }, []);
 
+    useEffect(() =>
+    {
+        // Opening the inbox clears the unread badge both locally and
+        // server-side so the toolbar count resets immediately.
+        const clearMentionsBadge = () =>
+        {
+            markAllRead();
+            SendMessageComposer(new MarkMentionsReadComposer(0, 0));
+        };
+
+        const linkTracker: ILinkEventTracker = {
+            linkReceived: (url: string) =>
+            {
+                const parts = url.split('/');
+
+                if(parts.length < 2) return;
+
+                switch(parts[1])
+                {
+                    case 'show':
+                        setMentionsVisible(true);
+                        clearMentionsBadge();
+                        return;
+                    case 'hide':
+                        setMentionsVisible(false);
+                        return;
+                    case 'toggle':
+                        setMentionsVisible(prevValue =>
+                        {
+                            if(prevValue) return false;
+
+                            // Side-effect-free in the updater: defer the
+                            // badge-clear to a microtask so React's
+                            // double-invoke (StrictMode) can't fire it twice.
+                            queueMicrotask(clearMentionsBadge);
+                            return true;
+                        });
+                        return;
+                }
+            },
+            eventUrlPrefix: 'mentions/'
+        };
+
+        AddLinkEventTracker(linkTracker);
+
+        return () => RemoveLinkEventTracker(linkTracker);
+    }, []);
+
     useEffect(() =>
     {
         const refreshLocalization = () => setLocalizationVersion(value => (value + 1));
@@ -187,6 +240,8 @@ export const MainView: FC<{}> = props =>
             <FortuneWheelView />
             <SoundboardView />
             { GetConfigurationValue<boolean>('radio_ui.enabled', false) && <RadioView /> }
+            { (GetConfigurationValue<boolean>('mentions_ui.enabled', true) && mentionsVisible) &&
+                <MentionsView onClose={ () => setMentionsVisible(false) } /> }
             <ExternalPluginLoader />
         </>
     );

src/components/chat-history/ChatHistoryView.tsx

@@ -1,15 +1,24 @@
 import { AddLinkEventTracker, ILinkEventTracker, RemoveLinkEventTracker } from '@nitrots/nitro-renderer';
 import { FC, useEffect, useMemo, useRef, useState } from 'react';
 import { ChatEntryType, LocalizeText } from '../../api';
-import { Flex, NitroCardContentView, NitroCardHeaderView, NitroCardView, Text } from '../../common';
+import { Flex, NitroCardContentView, NitroCardHeaderView, NitroCardTabsItemView, NitroCardTabsView, NitroCardView, Text } from '../../common';
-import { useChatHistory, useOnClickChat } from '../../hooks';
+import { useChatHistory, useMentionsSnapshot, useOnClickChat } from '../../hooks';
+import { useUserDataSnapshot } from '../../hooks/session/useSessionSnapshots';
 import { NitroInput } from '../../layout';
+import { MentionRowView, useMentionActions } from '../mentions';
+
+const TAB_CHAT = 'chat';
+const TAB_MENTIONS = 'mentions';
 
 export const ChatHistoryView: FC<{}> = props =>
 {
     const [isVisible, setIsVisible] = useState(false);
     const [searchText, setSearchText] = useState<string>('');
+    const [activeTab, setActiveTab] = useState<string>(TAB_CHAT);
     const { chatHistory = [] } = useChatHistory();
+    const { mentions, unreadCount } = useMentionsSnapshot();
+    const { userName: ownMentionUsername = '' } = useUserDataSnapshot();
+    const { open: onMentionOpen, goto: onMentionGoto, remove: onMentionRemove } = useMentionActions();
     const { onClickChat } = useOnClickChat();
     const elementRef = useRef<HTMLDivElement>(null);
     const isFirstRender = useRef(true);
@@ -87,7 +96,31 @@ export const ChatHistoryView: FC<{}> = props =>
     return (
         <NitroCardView className="w-[400px] h-[400px] bg-[#f0f0f0]" theme="primary-slim" uniqueKey="chat-history">
             <NitroCardHeaderView headerText={LocalizeText('room.chathistory.button.text')} onCloseClick={event => setIsVisible(false)} />
+            <NitroCardTabsView>
+                <NitroCardTabsItemView isActive={ activeTab === TAB_CHAT } onClick={ () => setActiveTab(TAB_CHAT) }>
+                    { LocalizeText('room.chathistory.button.text') }
+                </NitroCardTabsItemView>
+                <NitroCardTabsItemView count={ unreadCount } isActive={ activeTab === TAB_MENTIONS } onClick={ () => setActiveTab(TAB_MENTIONS) }>
+                    { LocalizeText('mentions.tab.title') }
+                </NitroCardTabsItemView>
+            </NitroCardTabsView>
             <NitroCardContentView className="h-full bg-[#f0f0f0] bg-[url('@/assets/images/chat/chathistory_background.png')] bg-repeat bg-auto" gap={2} overflow="hidden" style={{ height: 'calc(100% - 40px)', display: 'flex', flexDirection: 'column' }}>
+                { activeTab === TAB_MENTIONS ? (
+                    <div style={{ flex: 1, overflowY: 'auto', background: 'inherit' }}>
+                        { (mentions.length === 0)
+                            ? <Text center variant="gray">{ LocalizeText('mentions.window.empty') }</Text>
+                            : mentions.map(mention => (
+                                <MentionRowView
+                                    key={ mention.mentionId }
+                                    mention={ mention }
+                                    onGoto={ onMentionGoto }
+                                    onOpen={ onMentionOpen }
+                                    onRemove={ onMentionRemove }
+                                    ownUsername={ ownMentionUsername } />
+                            )) }
+                    </div>
+                ) : (
+                  <>
                 <NitroInput placeholder={LocalizeText('generic.search')} type="text" value={searchText} onChange={event => setSearchText(event.target.value)} />
                 <div ref={elementRef} style={{ flex: 1, overflowY: 'auto', background: 'inherit' }}>
                     {filteredChatHistory.map((row, index) => (
@@ -119,6 +152,8 @@ export const ChatHistoryView: FC<{}> = props =>
                         </Flex>
                     ))}
                 </div>
+                  </>
+                ) }
             </NitroCardContentView>
         </NitroCardView>
     );

src/components/mentions/MentionMessageView.tsx

@@ -0,0 +1,36 @@
+import { FC, Fragment, ReactNode } from 'react';
+import { tokenIsMention } from '../room/widgets/chat/highlightMentions';
+
+interface MentionMessageViewProps
+{
+    text: string;
+    ownUsername: string;
+    className?: string;
+}
+
+/**
+ * Renders a mention's message text as React nodes, wrapping the token(s) that
+ * mention the local user or a room-broadcast alias in a `.mention-highlight`
+ * span. Pure text segmentation (no innerHTML) → no XSS risk from other users'
+ * chat content. Original spacing is preserved verbatim.
+ */
+export const MentionMessageView: FC<MentionMessageViewProps> = props =>
+{
+    const { text, ownUsername, className } = props;
+
+    if(!text) return <span className={ className } />;
+
+    const nodes: ReactNode[] = text.split(/(\s+)/).map((segment, index) =>
+    {
+        if(segment.length === 0) return null;
+
+        if(/^\s+$/.test(segment) || !tokenIsMention(segment, ownUsername))
+        {
+            return <Fragment key={ index }>{ segment }</Fragment>;
+        }
+
+        return <span key={ index } className="mention-highlight">{ segment }</span>;
+    });
+
+    return <span className={ className }>{ nodes }</span>;
+};

src/components/mentions/MentionRowView.tsx

@@ -0,0 +1,66 @@
+import { FC, MouseEvent } from 'react';
+import { IMentionEntry, LocalizeText, MentionType } from '../../api';
+import { Flex, Text } from '../../common';
+import { MentionMessageView } from './MentionMessageView';
+import { formatMentionTime } from './mentionsFormat';
+
+interface MentionRowViewProps
+{
+    mention: IMentionEntry;
+    ownUsername: string;
+    onOpen: (mention: IMentionEntry) => void;
+    onGoto?: (mention: IMentionEntry) => void;
+    onRemove?: (mention: IMentionEntry) => void;
+}
+
+export const MentionRowView: FC<MentionRowViewProps> = props =>
+{
+    const { mention, ownUsername, onOpen, onGoto = null, onRemove = null } = props;
+
+    const isRoom = (mention.mentionType === MentionType.ROOM);
+    const typeTitle = LocalizeText(isRoom ? 'mentions.type.room' : 'mentions.type.direct');
+    const time = formatMentionTime(mention.timestamp);
+
+    const stop = (event: MouseEvent, action: () => void) =>
+    {
+        event.stopPropagation();
+        action();
+    };
+
+    return (
+        <Flex pointer alignItems="center" className="group relative px-1 py-[3px] rounded hover:bg-black/5" gap={ 2 } onClick={ () => onOpen(mention) }>
+            <span
+                className={ `inline-block w-[8px] h-[8px] rounded-full shrink-0 ${ mention.read ? 'bg-transparent' : 'bg-[#1e7295]' }` }
+                title={ mention.read ? '' : LocalizeText('mentions.filter.unread') } />
+            <span
+                title={ typeTitle }
+                className={ `flex items-center justify-center shrink-0 w-[18px] h-[18px] rounded text-[10px] font-bold leading-none text-white ${ isRoom ? 'bg-[#d08a1e]' : 'bg-[#1e7295]' }` }>
+                { isRoom ? '@∗' : '@' }
+            </span>
+            <Flex grow column className="min-w-0" gap={ 0 }>
+                <Flex alignItems="center" gap={ 1 } className="min-w-0">
+                    <Text bold={ !mention.read } truncate variant="primary">{ mention.senderUsername }</Text>
+                    { (mention.roomName && mention.roomName.length > 0) &&
+                        <Text small truncate variant="gray">· { mention.roomName }</Text> }
+                </Flex>
+                <MentionMessageView className="block truncate text-black text-sm" ownUsername={ ownUsername } text={ mention.message } />
+            </Flex>
+            <Flex alignItems="center" gap={ 1 } className="shrink-0">
+                { (time.length > 0) &&
+                    <Text small variant="gray" className="tabular-nums group-hover:hidden">{ time }</Text> }
+                <Flex alignItems="center" gap={ 1 } className="hidden group-hover:flex">
+                    { onGoto &&
+                        <span
+                            title={ LocalizeText('mentions.action.goto') }
+                            className="flex items-center justify-center w-[18px] h-[18px] rounded bg-black/10 hover:bg-black/20 text-[12px] leading-none"
+                            onClick={ event => stop(event, () => onGoto(mention)) }>→</span> }
+                    { onRemove &&
+                        <span
+                            title={ LocalizeText('mentions.action.remove') }
+                            className="flex items-center justify-center w-[18px] h-[18px] rounded bg-black/10 hover:bg-red-500 hover:text-white text-[11px] leading-none"
+                            onClick={ event => stop(event, () => onRemove(mention)) }>✕</span> }
+                </Flex>
+            </Flex>
+        </Flex>
+    );
+};

src/components/mentions/MentionsView.tsx

@@ -0,0 +1,124 @@
+import { MarkMentionsReadComposer } from '@nitrots/nitro-renderer';
+import { FC, useCallback, useMemo, useState } from 'react';
+import { IMentionEntry, LocalizeText, MentionType, SendMessageComposer } from '../../api';
+import { Button, Flex, NitroCardContentView, NitroCardHeaderView, NitroCardView, Text } from '../../common';
+import { useMentionsSnapshot } from '../../hooks';
+import { markAllRead } from '../../hooks/mentions/mentionsStore';
+import { useUserDataSnapshot } from '../../hooks/session/useSessionSnapshots';
+import { MentionRowView } from './MentionRowView';
+import { getMentionDateGroup, MentionDateGroup } from './mentionsFormat';
+import { useMentionActions } from './useMentionActions';
+
+interface MentionsViewProps
+{
+    onClose: () => void;
+}
+
+type MentionFilter = 'all' | 'unread' | 'direct' | 'room';
+
+const FILTERS: ReadonlyArray<{ key: MentionFilter; label: string }> = [
+    { key: 'all', label: 'mentions.filter.all' },
+    { key: 'unread', label: 'mentions.filter.unread' },
+    { key: 'direct', label: 'mentions.filter.direct' },
+    { key: 'room', label: 'mentions.filter.room' }
+];
+
+const GROUP_ORDER: ReadonlyArray<MentionDateGroup> = [ 'today', 'yesterday', 'older' ];
+const GROUP_LABEL: Record<MentionDateGroup, string> = {
+    today: 'mentions.group.today',
+    yesterday: 'mentions.group.yesterday',
+    older: 'mentions.group.older'
+};
+
+const matchesFilter = (mention: IMentionEntry, filter: MentionFilter): boolean =>
+{
+    switch(filter)
+    {
+        case 'unread': return !mention.read;
+        case 'direct': return mention.mentionType === MentionType.DIRECT;
+        case 'room': return mention.mentionType === MentionType.ROOM;
+        default: return true;
+    }
+};
+
+export const MentionsView: FC<MentionsViewProps> = props =>
+{
+    const { onClose } = props;
+    const { mentions, unreadCount } = useMentionsSnapshot();
+    const { userName: ownUsername = '' } = useUserDataSnapshot();
+    const { open, goto, remove } = useMentionActions();
+    const [ filter, setFilter ] = useState<MentionFilter>('all');
+
+    const onMarkAll = useCallback(() =>
+    {
+        markAllRead();
+        SendMessageComposer(new MarkMentionsReadComposer(0, 0));
+    }, []);
+
+    const groups = useMemo(() =>
+    {
+        const buckets: Record<MentionDateGroup, IMentionEntry[]> = { today: [], yesterday: [], older: [] };
+
+        for(const mention of mentions)
+        {
+            if(!matchesFilter(mention, filter)) continue;
+            buckets[getMentionDateGroup(mention.timestamp)].push(mention);
+        }
+
+        return GROUP_ORDER
+            .map(key => ({ key, items: buckets[key] }))
+            .filter(group => group.items.length > 0);
+    }, [ mentions, filter ]);
+
+    const hasAny = groups.length > 0;
+
+    return (
+        <NitroCardView className="w-[360px] h-[440px]" theme="primary-slim" uniqueKey="mentions">
+            <NitroCardHeaderView headerText={ LocalizeText('mentions.window.title') } onCloseClick={ onClose } />
+            <NitroCardContentView gap={ 1 }>
+                <Flex alignItems="center" className="flex-wrap" gap={ 1 }>
+                    { FILTERS.map(({ key, label }) =>
+                    {
+                        const active = (filter === key);
+                        const showCount = ((key === 'unread') && (unreadCount > 0));
+
+                        return (
+                            <button
+                                key={ key }
+                                type="button"
+                                onClick={ () => setFilter(key) }
+                                className={ `px-2 py-[2px] rounded-full text-xs border transition-colors ${ active ? 'bg-[#1e7295] text-white border-[#1e7295]' : 'bg-black/5 text-black/70 border-transparent hover:bg-black/10' }` }>
+                                { LocalizeText(label) }{ showCount ? ` (${ unreadCount })` : '' }
+                            </button>
+                        );
+                    }) }
+                </Flex>
+                <Flex grow column className="min-h-0 overflow-y-auto" gap={ 0 }>
+                    { !hasAny &&
+                        <Flex grow column center gap={ 2 } className="py-6 text-center">
+                            <span className="flex items-center justify-center w-[44px] h-[44px] rounded-full bg-black/5 text-[#1e7295] text-[22px] font-bold">@</span>
+                            <Text center variant="gray">{ LocalizeText('mentions.window.empty') }</Text>
+                        </Flex> }
+                    { hasAny && groups.map(group => (
+                        <Flex key={ group.key } column gap={ 0 }>
+                            <Text small bold variant="gray" className="px-1 pt-2 pb-[2px] uppercase tracking-wide">
+                                { LocalizeText(GROUP_LABEL[group.key]) }
+                            </Text>
+                            { group.items.map(mention => (
+                                <MentionRowView
+                                    key={ mention.mentionId }
+                                    mention={ mention }
+                                    onGoto={ goto }
+                                    onOpen={ open }
+                                    onRemove={ remove }
+                                    ownUsername={ ownUsername } />
+                            )) }
+                        </Flex>
+                    )) }
+                </Flex>
+                { (unreadCount > 0) &&
+                    <Button variant="primary" onClick={ onMarkAll }>{ LocalizeText('mentions.window.markall') }</Button> }
+            </NitroCardContentView>
+        </NitroCardView>
+    );
+};

src/components/mentions/index.ts

@@ -0,0 +1,5 @@
+export * from './MentionMessageView';
+export * from './MentionRowView';
+export * from './MentionsView';
+export * from './mentionsFormat';
+export * from './useMentionActions';

src/components/mentions/mentionsFormat.test.ts

@@ -0,0 +1,52 @@
+import { describe, expect, it } from 'vitest';
+import { formatMentionTime, getMentionDateGroup } from './mentionsFormat';
+
+// Fixed reference "now": 2026-06-02 14:30 local time.
+const NOW = new Date(2026, 5, 2, 14, 30, 0);
+const at = (y: number, mo: number, d: number, h = 12, mi = 0): number => Math.floor(new Date(y, mo, d, h, mi, 0).getTime() / 1000);
+
+describe('getMentionDateGroup', () =>
+{
+    it('buckets same-day as today', () =>
+    {
+        expect(getMentionDateGroup(at(2026, 5, 2, 9, 15), NOW)).toBe('today');
+    });
+
+    it('buckets previous day as yesterday', () =>
+    {
+        expect(getMentionDateGroup(at(2026, 5, 1, 23, 59), NOW)).toBe('yesterday');
+    });
+
+    it('buckets two+ days ago as older', () =>
+    {
+        expect(getMentionDateGroup(at(2026, 4, 28, 10, 0), NOW)).toBe('older');
+    });
+
+    it('treats missing/zero timestamp as older', () =>
+    {
+        expect(getMentionDateGroup(0, NOW)).toBe('older');
+    });
+});
+
+describe('formatMentionTime', () =>
+{
+    it('shows HH:MM (zero-padded) for today', () =>
+    {
+        expect(formatMentionTime(at(2026, 5, 2, 9, 5), NOW)).toBe('09:05');
+    });
+
+    it('shows HH:MM for yesterday', () =>
+    {
+        expect(formatMentionTime(at(2026, 5, 1, 18, 45), NOW)).toBe('18:45');
+    });
+
+    it('shows DD-MM for older entries', () =>
+    {
+        expect(formatMentionTime(at(2026, 4, 28, 10, 0), NOW)).toBe('28-05');
+    });
+
+    it('returns empty string for missing timestamp', () =>
+    {
+        expect(formatMentionTime(0, NOW)).toBe('');
+    });
+});

src/components/mentions/mentionsFormat.ts

@@ -0,0 +1,41 @@
+// Date/time helpers for the mentions box. Kept framework-free and pure so they
+// are unit-testable. Timestamps are unix SECONDS (as carried on the wire).
+
+export type MentionDateGroup = 'today' | 'yesterday' | 'older';
+
+const DAY_MS = 86_400_000;
+
+const startOfDay = (d: Date): number => new Date(d.getFullYear(), d.getMonth(), d.getDate()).getTime();
+
+const pad = (n: number): string => (n < 10 ? `0${ n }` : `${ n }`);
+
+/**
+ * Bucket a mention timestamp into today / yesterday / older relative to `now`.
+ */
+export const getMentionDateGroup = (timestampSeconds: number, now: Date = new Date()): MentionDateGroup =>
+{
+    if(!timestampSeconds || timestampSeconds <= 0) return 'older';
+
+    const ts = timestampSeconds * 1000;
+    const todayStart = startOfDay(now);
+
+    if(ts >= todayStart) return 'today';
+    if(ts >= (todayStart - DAY_MS)) return 'yesterday';
+
+    return 'older';
+};
+
+/**
+ * Compact per-row time label: HH:MM for today/yesterday (the section header
+ * disambiguates the day), DD-MM for older entries. Empty string when unknown.
+ */
+export const formatMentionTime = (timestampSeconds: number, now: Date = new Date()): string =>
+{
+    if(!timestampSeconds || timestampSeconds <= 0) return '';
+
+    const d = new Date(timestampSeconds * 1000);
+
+    if(getMentionDateGroup(timestampSeconds, now) === 'older') return `${ pad(d.getDate()) }-${ pad(d.getMonth() + 1) }`;
+
+    return `${ pad(d.getHours()) }:${ pad(d.getMinutes()) }`;
+};

src/components/mentions/useMentionActions.ts

@@ -0,0 +1,39 @@
+import { CreateLinkEvent, DeleteMentionComposer, MarkMentionsReadComposer } from '@nitrots/nitro-renderer';
+import { useMemo } from 'react';
+import { IMentionEntry, SendMessageComposer } from '../../api';
+import { markRead, removeMention } from '../../hooks/mentions/mentionsStore';
+
+export interface MentionActions
+{
+    /** Row click: mark the mention as read (no navigation). */
+    open: (mention: IMentionEntry) => void;
+    /** Explicit "go to room" action: mark read, then jump to the origin room. */
+    goto: (mention: IMentionEntry) => void;
+    /** Permanently delete the mention server-side (DeleteMentionComposer) and
+     *  drop it from the local list, so it does not reappear after a relog. */
+    remove: (mention: IMentionEntry) => void;
+}
+
+const markReadOnServer = (mention: IMentionEntry): void =>
+{
+    if(mention.read) return;
+    markRead(mention.mentionId);
+    SendMessageComposer(new MarkMentionsReadComposer(1, mention.mentionId));
+};
+
+// Shared action handlers used by both MentionsView and the chat-history
+// "Menzioni" tab so behaviour can't diverge.
+export const useMentionActions = (): MentionActions => useMemo(() => ({
+    open: (mention) => markReadOnServer(mention),
+    goto: (mention) =>
+    {
+        markReadOnServer(mention);
+        if(mention.roomId > 0) CreateLinkEvent(`navigator/goto/${ mention.roomId }`);
+    },
+    remove: (mention) =>
+    {
+        // Permanent server-side delete, then drop it from the local list.
+        SendMessageComposer(new DeleteMentionComposer(mention.mentionId));
+        removeMention(mention.mentionId);
+    }
+}), []);

src/components/room/widgets/chat/ChatWidgetMessageView.tsx

@@ -1,8 +1,10 @@
 import { GetRoomEngine, RoomChatSettings, RoomObjectCategory } from '@nitrots/nitro-renderer';
 import { FC, useEffect, useMemo, useRef, useState } from 'react';
-import { ChatBubbleMessage } from '../../../../api';
+import { ChatBubbleMessage, GetConfigurationValue } from '../../../../api';
 import { UserIdentityView } from '../../../../common';
 import { useOnClickChat } from '../../../../hooks';
+import { useUserDataSnapshot } from '../../../../hooks/session/useSessionSnapshots';
+import { highlightMentions } from './highlightMentions';
 
 interface ChatWidgetMessageViewProps
 {
@@ -21,6 +23,15 @@ export const ChatWidgetMessageView: FC<ChatWidgetMessageViewProps> = ({
     const [ isReady, setIsReady ] = useState(false);
     const elementRef = useRef<HTMLDivElement>(null);
     const { onClickChat } = useOnClickChat();
+    const { userName: ownUsername = '' } = useUserDataSnapshot();
+
+    const mentionsHighlightOn = GetConfigurationValue<boolean>('mentions_ui.enabled', true);
+
+    const highlight = (html: string): string => (mentionsHighlightOn ? highlightMentions(html, ownUsername) : html);
+
+    const formattedText = useMemo(() => highlight(`${ chat.formattedText }`), [ chat.formattedText, ownUsername, mentionsHighlightOn ]);
+    const originalFormattedText = useMemo(() => highlight(`${ chat.originalFormattedText || chat.formattedText }`), [ chat.originalFormattedText, chat.formattedText, ownUsername, mentionsHighlightOn ]);
+    const translatedFormattedText = useMemo(() => highlight(`${ chat.translatedFormattedText || chat.formattedText }`), [ chat.translatedFormattedText, chat.formattedText, ownUsername, mentionsHighlightOn ]);
 
     const getBubbleWidth = useMemo(() =>
     {
@@ -112,16 +123,16 @@ export const ChatWidgetMessageView: FC<ChatWidgetMessageViewProps> = ({
                         showColon={ true }
                         username={ chat.username } />
                     { !chat.showTranslation &&
-                        <span className={ `${ messageClassName } align-middle` } dangerouslySetInnerHTML={ { __html: `${ chat.formattedText }` } } onClick={ onClickChat } /> }
+                        <span className={ `${ messageClassName } align-middle` } dangerouslySetInnerHTML={ { __html: formattedText } } onClick={ onClickChat } /> }
                     { chat.showTranslation &&
                         <div className="mt-[2px] flex flex-col gap-[2px]" onClick={ onClickChat }>
                             <div className="flex items-start gap-1 leading-[1.1]">
                                 <span className="inline-block min-w-[52px] font-bold" style={ { opacity: 0.75 } }>original:</span>
-                                <span className={ messageClassName } dangerouslySetInnerHTML={ { __html: `${ chat.originalFormattedText || chat.formattedText }` } } />
+                                <span className={ messageClassName } dangerouslySetInnerHTML={ { __html: originalFormattedText } } />
                             </div>
                             <div className="flex items-start gap-1 leading-[1.1]">
                                 <span className="inline-block min-w-[52px] font-bold" style={ { opacity: 0.75 } }>translate:</span>
-                                <span className={ messageClassName } dangerouslySetInnerHTML={ { __html: `${ chat.translatedFormattedText || chat.formattedText }` } } />
+                                <span className={ messageClassName } dangerouslySetInnerHTML={ { __html: translatedFormattedText } } />
                             </div>
                         </div> }
                 </div>

src/components/room/widgets/chat/highlightMentions.test.ts

@@ -0,0 +1,120 @@
+import { describe, expect, it } from 'vitest';
+import { highlightMentions, MENTION_ROOM_ALIASES } from './highlightMentions';
+
+const OPEN = '<span class="mention-highlight">';
+const CLOSE = '</span>';
+
+describe('highlightMentions', () =>
+{
+    it('highlights the own-nick token', () =>
+    {
+        const out = highlightMentions('hello @Bob how are you', 'Bob');
+
+        expect(out).toBe(`hello ${ OPEN }@Bob${ CLOSE } how are you`);
+    });
+
+    it('highlights a room-broadcast alias token', () =>
+    {
+        const out = highlightMentions('@all party time', 'Bob');
+
+        expect(out).toBe(`${ OPEN }@all${ CLOSE } party time`);
+    });
+
+    it('highlights every configured room alias', () =>
+    {
+        for(const alias of MENTION_ROOM_ALIASES)
+        {
+            const out = highlightMentions(`hey @${ alias }!`, 'Bob');
+
+            expect(out).toBe(`hey ${ OPEN }@${ alias }!${ CLOSE }`);
+        }
+    });
+
+    it('leaves non-mention text untouched', () =>
+    {
+        const text = 'just a normal sentence with no at signs';
+
+        expect(highlightMentions(text, 'Bob')).toBe(text);
+    });
+
+    it('returns the message unchanged when there is no mention of me or an alias', () =>
+    {
+        const text = 'hi @Charlie and @Dave';
+
+        // Neither @Charlie nor @Dave is the local user or a room alias.
+        expect(highlightMentions(text, 'Bob')).toBe(text);
+    });
+
+    it('matches a token with trailing punctuation (mirrors server stripping)', () =>
+    {
+        const out = highlightMentions('watch out @Bob! seriously', 'Bob');
+
+        // The original token text (including the `!`) is kept inside the span.
+        expect(out).toBe(`watch out ${ OPEN }@Bob!${ CLOSE } seriously`);
+    });
+
+    it('matches case-insensitively but preserves the original casing', () =>
+    {
+        const out = highlightMentions('yo @bOb whatup', 'BOB');
+
+        expect(out).toBe(`yo ${ OPEN }@bOb${ CLOSE } whatup`);
+    });
+
+    it('preserves the original spacing verbatim', () =>
+    {
+        const out = highlightMentions('a   @Bob\tb', 'Bob');
+
+        expect(out).toBe(`a   ${ OPEN }@Bob${ CLOSE }\tb`);
+    });
+
+    it('does not highlight inside HTML tags produced by the formatter', () =>
+    {
+        // Formatter output: wired bold markup around a mention.
+        const out = highlightMentions('<strong>hi @Bob</strong>', 'Bob');
+
+        expect(out).toBe(`<strong>hi ${ OPEN }@Bob${ CLOSE }</strong>`);
+    });
+
+    it('leaves font-colour spans and line breaks intact', () =>
+    {
+        const html = '<span style="color:red">hi @Bob</span><br />bye';
+        const out = highlightMentions(html, 'Bob');
+
+        expect(out).toBe(`<span style="color:red">hi ${ OPEN }@Bob${ CLOSE }</span><br />bye`);
+    });
+
+    it('highlights multiple distinct mentions in one message', () =>
+    {
+        const out = highlightMentions('@Bob and @all listen', 'Bob');
+
+        expect(out).toBe(`${ OPEN }@Bob${ CLOSE } and ${ OPEN }@all${ CLOSE } listen`);
+    });
+
+    it('ignores a bare @ with no nick', () =>
+    {
+        const text = 'email me @ home';
+
+        expect(highlightMentions(text, 'Bob')).toBe(text);
+    });
+
+    it('returns input verbatim when there is no @ at all (fast path)', () =>
+    {
+        const text = 'plain message';
+
+        expect(highlightMentions(text, 'Bob')).toBe(text);
+    });
+
+    it('returns input verbatim when own username is empty and no alias matches', () =>
+    {
+        const text = 'hi @Charlie';
+
+        expect(highlightMentions(text, '')).toBe(text);
+    });
+
+    it('still highlights aliases when own username is empty', () =>
+    {
+        const out = highlightMentions('@everyone hi', '');
+
+        expect(out).toBe(`${ OPEN }@everyone${ CLOSE } hi`);
+    });
+});

src/components/room/widgets/chat/highlightMentions.tsx

@@ -0,0 +1,167 @@
+/**
+ * Cosmetic-only mention highlighting for in-room chat bubbles.
+ *
+ * The bubble text is rendered through {@link RoomChatFormatter}, which emits
+ * an HTML string (wired markup `<strong>`/`<em>`/`<u>`, font-colour
+ * `<span style>`, `<br />`, plus HTML-entity-encoded special characters) and
+ * is injected via `dangerouslySetInnerHTML`. We therefore operate on the
+ * already-formatted HTML string and wrap mention tokens that appear in the
+ * TEXT regions (never inside a `<tag>`), returning a new HTML string. This
+ * keeps every existing formatting behaviour intact and is purely visual — it
+ * does not touch `chat.text`, parsing, chat history, or any wire payload.
+ *
+ * Token detection mirrors the server's `MentionManager.process` exactly:
+ *   - split on whitespace
+ *   - a candidate token has length >= 2 and starts with `@`
+ *   - strip the `@`, remove every char that is not [A-Za-z0-9_], lowercase
+ *   - match against the local username or a room-broadcast alias
+ *
+ * This means `@Bob!`, `@bob,` etc. all match the nick `Bob` (case-insensitive)
+ * just like the server, while the highlighted span keeps the original token
+ * text (`@` + original casing + trailing punctuation) verbatim.
+ */
+
+// Mirror of `mentions.room.aliases` default in Arcturus
+// (com.eu.habbo.habbohotel.mentions.MentionManager#roomAliases).
+export const MENTION_ROOM_ALIASES: ReadonlyArray<string> = [
+    'amici', 'friends', 'all', 'everyone', 'tutti', 'room', 'stanza'
+];
+
+const NON_NICK_CHARS = /[^A-Za-z0-9_]/g;
+
+/**
+ * Normalise a raw `@token` the same way the server does: drop the leading `@`,
+ * strip any non-nick characters (trailing punctuation, etc.), lowercase.
+ * Returns an empty string when nothing usable remains.
+ */
+const normalizeToken = (token: string): string =>
+{
+    if(!token || token.length < 2 || token.charAt(0) !== '@') return '';
+
+    return token.substring(1).replace(NON_NICK_CHARS, '').toLowerCase();
+};
+
+/**
+ * Whether the given raw whitespace-delimited token mentions the local user
+ * or a room-broadcast alias.
+ */
+const isMentionToken = (token: string, ownUsernameLower: string, aliases: ReadonlySet<string>): boolean =>
+{
+    const nick = normalizeToken(token);
+
+    if(!nick) return false;
+
+    if(ownUsernameLower && nick === ownUsernameLower) return true;
+
+    return aliases.has(nick);
+};
+
+/**
+ * Public predicate: does this raw whitespace-delimited token mention the given
+ * user or a room-broadcast alias? Mirrors the server's detection. Reusable by
+ * UI that renders mention previews as React nodes (e.g. the mentions box).
+ */
+export const tokenIsMention = (
+    token: string,
+    ownUsername: string,
+    aliases: ReadonlyArray<string> = MENTION_ROOM_ALIASES
+): boolean =>
+{
+    const ownUsernameLower = (ownUsername || '').replace(NON_NICK_CHARS, '').toLowerCase();
+    return isMentionToken(token, ownUsernameLower, new Set(aliases.map(a => a.toLowerCase())));
+};
+
+const HIGHLIGHT_OPEN = '<span class="mention-highlight">';
+const HIGHLIGHT_CLOSE = '</span>';
+
+/**
+ * Wrap mention tokens in a single text chunk (no HTML tags inside it).
+ * Whitespace runs between tokens are preserved verbatim by re-using the
+ * original substrings around each match.
+ */
+const highlightTextChunk = (chunk: string, ownUsernameLower: string, aliases: ReadonlySet<string>): string =>
+{
+    if(chunk.indexOf('@') < 0) return chunk;
+
+    // Split into alternating [whitespace, token, whitespace, token, ...]
+    // segments so the exact original spacing is rebuilt unchanged.
+    const segments = chunk.split(/(\s+)/);
+
+    let result = '';
+
+    for(const segment of segments)
+    {
+        if(segment.length === 0) continue;
+
+        // Whitespace runs and non-mention tokens pass through untouched.
+        if(/^\s+$/.test(segment) || !isMentionToken(segment, ownUsernameLower, aliases))
+        {
+            result += segment;
+            continue;
+        }
+
+        result += `${ HIGHLIGHT_OPEN }${ segment }${ HIGHLIGHT_CLOSE }`;
+    }
+
+    return result;
+};
+
+/**
+ * Take the formatted bubble HTML and return new HTML where every mention
+ * token (own nick or room alias) in the text regions is wrapped in
+ * `<span class="mention-highlight">…</span>`. HTML tags are passed through
+ * untouched so existing markup keeps working.
+ *
+ * Returns the input unchanged when there is no `@`, no own username, and no
+ * possibility of a match (fast path), or when nothing matches.
+ */
+export const highlightMentions = (
+    formattedHtml: string,
+    ownUsername: string,
+    aliases: ReadonlyArray<string> = MENTION_ROOM_ALIASES
+): string =>
+{
+    if(!formattedHtml || formattedHtml.indexOf('@') < 0) return formattedHtml;
+
+    const ownUsernameLower = (ownUsername || '').replace(NON_NICK_CHARS, '').toLowerCase();
+    const aliasSet = new Set(aliases.map(a => a.toLowerCase()));
+
+    // Nothing could ever match → return verbatim.
+    if(!ownUsernameLower && aliasSet.size === 0) return formattedHtml;
+
+    // Walk the string, only highlighting inside text regions (outside `<...>`).
+    let result = '';
+    let cursor = 0;
+
+    while(cursor < formattedHtml.length)
+    {
+        const tagStart = formattedHtml.indexOf('<', cursor);
+
+        if(tagStart < 0)
+        {
+            result += highlightTextChunk(formattedHtml.slice(cursor), ownUsernameLower, aliasSet);
+            break;
+        }
+
+        // Text region before the next tag.
+        if(tagStart > cursor)
+        {
+            result += highlightTextChunk(formattedHtml.slice(cursor, tagStart), ownUsernameLower, aliasSet);
+        }
+
+        const tagEnd = formattedHtml.indexOf('>', tagStart);
+
+        if(tagEnd < 0)
+        {
+            // Malformed trailing `<` with no closing `>` — emit the rest verbatim.
+            result += formattedHtml.slice(tagStart);
+            break;
+        }
+
+        // Emit the tag (including the angle brackets) untouched.
+        result += formattedHtml.slice(tagStart, tagEnd + 1);
+        cursor = tagEnd + 1;
+    }
+
+    return result;
+};

src/components/toolbar/ToolbarView.tsx

@@ -3,7 +3,7 @@ import { AnimatePresence, motion, Variants } from 'framer-motion';
 import { FC, useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { GetConfigurationValue, isHousekeepingEnabled, MessengerIconState, OpenMessengerChat, setYoutubeRoomEnabled, VisitDesktop } from '../../api';
 import { Flex, LayoutAvatarImageView, LayoutItemCountView } from '../../common';
-import { useAchievements, useFriends, useHasPermission, useInventoryUnseenTracker, useMessageEvent, useMessenger, useModTools, useNitroEvent, useSessionInfo, useSoundboard, useWiredTools } from '../../hooks';
+import { useAchievements, useFriends, useHasPermission, useInventoryUnseenTracker, useMentionsSnapshot, useMessageEvent, useMessenger, useModTools, useNitroEvent, useSessionInfo, useSoundboard, useWiredTools } from '../../hooks';
 import { ToolbarItemView } from './ToolbarItemView';
 import { ToolbarMeView } from './ToolbarMeView';
 import { YouTubePlayerView } from './YouTubePlayerView';
@@ -42,6 +42,8 @@ export const ToolbarView: FC<{ isInRoom: boolean }> = props =>
     const { getTotalUnseen = 0 } = useAchievements();
     const { requests = [] } = useFriends();
     const { iconState = MessengerIconState.HIDDEN } = useMessenger();
+    const { unreadCount: mentionsUnread = 0 } = useMentionsSnapshot();
+    const mentionsEnabled = useMemo(() => GetConfigurationValue<boolean>('mentions_ui.enabled', true), []);
     const { openMonitor, showToolbarButton } = useWiredTools();
     const { enabled: soundboardEnabled, reset: resetSoundboard } = useSoundboard();
     const isMod = useHasPermission('acc_supporttool');
@@ -332,6 +334,12 @@ export const ToolbarView: FC<{ isInRoom: boolean }> = props =>
                         { (requests.length > 0) &&
                             <LayoutItemCountView count={ requests.length } className="absolute -right-2 -top-1" /> }
                     </motion.div>
+                    { mentionsEnabled &&
+                        <motion.div variants={ itemVariants } className="relative">
+                            <ToolbarItemView icon="mentions" onClick={ () => CreateLinkEvent('mentions/toggle') } className="tb-icon" />
+                            { (mentionsUnread > 0) &&
+                                <LayoutItemCountView count={ mentionsUnread } className="absolute -right-2 -top-1" /> }
+                        </motion.div> }
                     { ((iconState === MessengerIconState.SHOW) || (iconState === MessengerIconState.UNREAD)) &&
                         <motion.div variants={ itemVariants }>
                             <ToolbarItemView className={ `tb-icon ${ iconState === MessengerIconState.UNREAD ? 'is-unseen animate-pulse' : '' }` } icon="message" onClick={ () => OpenMessengerChat() } />
@@ -422,6 +430,12 @@ export const ToolbarView: FC<{ isInRoom: boolean }> = props =>
                         { (requests.length > 0) &&
                             <LayoutItemCountView count={ requests.length } className="absolute -right-2 -top-1" /> }
                     </motion.div>
+                    { mentionsEnabled &&
+                        <motion.div variants={ itemVariants } className="relative">
+                            <ToolbarItemView icon="mentions" onClick={ () => CreateLinkEvent('mentions/toggle') } className="tb-icon" />
+                            { (mentionsUnread > 0) &&
+                                <LayoutItemCountView count={ mentionsUnread } className="absolute -right-2 -top-1" /> }
+                        </motion.div> }
                 </motion.div>
             </motion.div>
             { /* Mobile side tools — moved out of the bottom bar into a

src/css/chat/Chats.css

@@ -2396,3 +2396,12 @@
     }
 
 }
+
+/* Mention highlight inside chat bubbles (cosmetic) */
+.mention-highlight {
+    font-weight: 700;
+    color: #1e7295;
+    background-color: rgba(30, 114, 149, 0.16);
+    border-radius: 3px;
+    padding: 0 2px;
+}

src/css/icons/icons.css

@@ -229,6 +229,13 @@
     height: 32px;
 }
 
+.nitro-icon.icon-mentions {
+    background-image: url("@/assets/images/toolbar/icons/mentions.png");
+    background-size: contain;
+    width: 36px;
+    height: 32px;
+}
+
 .nitro-icon.icon-wired-tools {
     background-image: url("@/assets/images/wiredtools/wired_menu.png");
     background-size: contain;

src/hooks/index.ts

@@ -11,6 +11,7 @@ export * from './groups';
 export * from './help';
 export * from './housekeeping';
 export * from './inventory';
+export * from './mentions';
 export * from './mod-tools';
 export * from './navigator';
 export * from './notification';

src/hooks/mentions/__tests__/mentionsStore.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, it, beforeEach } from 'vitest';
+import { addMention, setMentions, markAllRead, markRead, getMentionsSnapshot, getUnreadCount, resetMentions } from '../mentionsStore';
+import { IMentionEntry } from '../../../api/mentions';
+
+const make = (id: number, read = false): IMentionEntry => ({
+    mentionId: id, senderId: 1, senderUsername: 'Bob', roomId: 9, roomName: 'R',
+    message: '@me hi', mentionType: 0, timestamp: 0, read
+});
+
+describe('mentionsStore', () =>
+{
+    beforeEach(() => resetMentions());
+
+    it('adds newest-first and counts unread', () =>
+    {
+        addMention(make(1));
+        addMention(make(2));
+        expect(getMentionsSnapshot()[0].mentionId).toBe(2);
+        expect(getUnreadCount()).toBe(2);
+    });
+
+    it('setMentions replaces and recomputes unread', () =>
+    {
+        setMentions([make(1, true), make(2, false)]);
+        expect(getMentionsSnapshot()).toHaveLength(2);
+        expect(getUnreadCount()).toBe(1);
+    });
+
+    it('markAllRead zeroes unread', () =>
+    {
+        setMentions([make(1), make(2)]);
+        markAllRead();
+        expect(getUnreadCount()).toBe(0);
+    });
+
+    it('markRead clears a single entry', () =>
+    {
+        setMentions([make(1), make(2)]);
+        markRead(1);
+        expect(getUnreadCount()).toBe(1);
+        expect(getMentionsSnapshot().find(m => m.mentionId === 1)!.read).toBe(true);
+    });
+});

src/hooks/mentions/index.ts

@@ -0,0 +1,2 @@
+export * from './useMentionsSnapshot';
+export * from './useMentionMessages';

src/hooks/mentions/mentionsStore.ts

@@ -0,0 +1,51 @@
+import { IMentionEntry } from '../../api/mentions';
+
+let mentions: IMentionEntry[] = [];
+const listeners = new Set<() => void>();
+
+const emit = () => { for(const l of listeners) l(); };
+
+export const subscribeMentions = (onChange: () => void): (() => void) =>
+{
+    listeners.add(onChange);
+    return () => { listeners.delete(onChange); };
+};
+
+export const getMentionsSnapshot = (): ReadonlyArray<IMentionEntry> => mentions;
+
+export const getUnreadCount = (): number => mentions.reduce((n, m) => n + (m.read ? 0 : 1), 0);
+
+export const setMentions = (list: IMentionEntry[]): void =>
+{
+    mentions = [...list].sort((a, b) => b.mentionId - a.mentionId);
+    emit();
+};
+
+export const addMention = (entry: IMentionEntry): void =>
+{
+    if(mentions.some(m => m.mentionId === entry.mentionId && entry.mentionId !== 0)) return;
+    mentions = [entry, ...mentions];
+    emit();
+};
+
+export const markRead = (mentionId: number): void =>
+{
+    mentions = mentions.map(m => m.mentionId === mentionId ? { ...m, read: true } : m);
+    emit();
+};
+
+export const markAllRead = (): void =>
+{
+    mentions = mentions.map(m => m.read ? m : { ...m, read: true });
+    emit();
+};
+
+export const removeMention = (mentionId: number): void =>
+{
+    const next = mentions.filter(m => m.mentionId !== mentionId);
+    if(next.length === mentions.length) return;
+    mentions = next;
+    emit();
+};
+
+export const resetMentions = (): void => { mentions = []; emit(); };

src/hooks/mentions/useMentionMessages.ts

@@ -0,0 +1,72 @@
+import { MentionReceivedEvent, MentionsListEvent, RequestMentionsComposer } from '@nitrots/nitro-renderer';
+import { useCallback, useEffect } from 'react';
+import { GetConfigurationValue, IMentionEntry, LocalizeText, NotificationBubbleType, PlaySound, SendMessageComposer } from '../../api';
+import { useMessageEvent } from '../events';
+import { useNotificationActions } from '../notification';
+import { addMention, setMentions } from './mentionsStore';
+
+// Dedicated mention chime served from nitro-assets/sounds/<sample>.mp3.
+const MENTION_SOUND_SAMPLE = 'mentions_notification';
+
+export const useMentionMessages = (): void =>
+{
+    const { showSingleBubble } = useNotificationActions();
+
+    const onMentionsList = useCallback((event: MentionsListEvent) =>
+    {
+        const list = event.getParser().mentions;
+
+        setMentions(list.map(m => ({
+            mentionId: m.mentionId,
+            senderId: m.senderId,
+            senderUsername: m.senderUsername,
+            roomId: m.roomId,
+            roomName: m.roomName,
+            message: m.message,
+            mentionType: m.mentionType,
+            timestamp: m.timestamp,
+            read: m.read
+        })));
+    }, []);
+
+    const onMentionReceived = useCallback((event: MentionReceivedEvent) =>
+    {
+        if(!GetConfigurationValue<boolean>('mentions_ui.enabled', true)) return;
+
+        const m = event.getParser().mention;
+
+        const entry: IMentionEntry = {
+            mentionId: m.mentionId,
+            senderId: m.senderId,
+            senderUsername: m.senderUsername,
+            roomId: m.roomId,
+            roomName: m.roomName,
+            message: m.message,
+            mentionType: m.mentionType,
+            timestamp: m.timestamp,
+            read: false
+        };
+
+        addMention(entry);
+
+        if(GetConfigurationValue<boolean>('mentions_ui.sound', true)) PlaySound(MENTION_SOUND_SAMPLE);
+
+        showSingleBubble(
+            LocalizeText('mentions.notification', [ 'sender', 'room' ], [ entry.senderUsername, entry.roomName ]),
+            NotificationBubbleType.INFO,
+            null,
+            'mentions/toggle',
+            entry.senderUsername
+        );
+    }, [ showSingleBubble ]);
+
+    useMessageEvent<MentionsListEvent>(MentionsListEvent, onMentionsList);
+    useMessageEvent<MentionReceivedEvent>(MentionReceivedEvent, onMentionReceived);
+
+    useEffect(() =>
+    {
+        if(!GetConfigurationValue<boolean>('mentions_ui.enabled', true)) return;
+
+        SendMessageComposer(new RequestMentionsComposer());
+    }, []);
+};

src/hooks/mentions/useMentionsSnapshot.ts

@@ -0,0 +1,10 @@
+import { IMentionEntry } from '../../api/mentions';
+import { useExternalSnapshot } from '../events/useExternalSnapshot';
+import { getMentionsSnapshot, getUnreadCount, subscribeMentions } from './mentionsStore';
+
+export const useMentionsSnapshot = (): { mentions: ReadonlyArray<IMentionEntry>; unreadCount: number } =>
+{
+    const mentions = useExternalSnapshot(subscribeMentions, getMentionsSnapshot);
+    const unreadCount = useExternalSnapshot(subscribeMentions, getUnreadCount);
+    return { mentions, unreadCount };
+};

src/nitro-renderer.mock.ts

@@ -251,6 +251,11 @@ export class FlatAccessDeniedMessageEvent extends MessageEvent {}
 export class GenericErrorEvent extends MessageEvent {}
 export class GetGuestRoomResultEvent extends MessageEvent {}
 
+// Mentions system — incoming events extend MessageEvent (they expose
+// getParser()); the request/mark composers are symbol-only constructors.
+export class MentionReceivedEvent extends MessageEvent {}
+export class MentionsListEvent extends MessageEvent {}
+
 // ---------------------------------------------------------------------------
 // Navigator event classes — MessageEvent subclasses needed by useNavigatorStore
 // ---------------------------------------------------------------------------
@@ -377,6 +382,9 @@ export class FollowFriendMessageComposer extends StubClass {}
 export class GetUserEventCatsMessageComposer extends StubClass {}
 export class GetUserFlatCatsMessageComposer extends StubClass {}
 export class NavigatorSearchComposer extends StubClass {}
+export class RequestMentionsComposer extends StubClass {}
+export class MarkMentionsReadComposer extends StubClass {}
+export class DeleteMentionComposer extends StubClass {}
 export class DesktopViewComposer extends StubClass {}
 export class FurniturePlacePaintComposer extends StubClass {}
 export class GetGuestRoomMessageComposer extends StubClass {}