style(navigator): unify room-settings tabs with section cards

Introduce a reusable NavigatorRoomSettingsSectionView card (rounded
bg-gray-100 panel with a bold-small title) and apply it across the
Access, VIP/Chat, Moderation and Rights tabs so every room-settings
screen matches the Base and Misc tab styling. Pure visual restyle —
handleChange wiring, events, composers and validations are unchanged.

src/components/navigator/views/room-settings/NavigatorRoomSettingsSectionView.tsx

@@ -0,0 +1,22 @@
+import { FC, ReactNode } from 'react';
+import { Column, Text } from '../../../../common';
+
+interface NavigatorRoomSettingsSectionViewProps
+{
+    title?: string;
+    gap?: 1 | 2 | 3;
+    className?: string;
+    children: ReactNode;
+}
+
+export const NavigatorRoomSettingsSectionView: FC<NavigatorRoomSettingsSectionViewProps> = props =>
+{
+    const { title = null, gap = 2, className = '', children = null } = props;
+
+    return (
+        <Column gap={ gap } className={ `rounded bg-gray-100 p-3 ${ className }`.trim() }>
+            { title && <Text bold small>{ title }</Text> }
+            { children }
+        </Column>
+    );
+};