refactor(mod-tools): launcher box gets context strip + section grouping

The launcher panel was a flat stack of four buttons (Room Tool, Chatlog
Tool, selected-user + presence dot inline, Report Tool) with no visual
hierarchy. The selected-user row was particularly cramped — name, the
2px dot and the 4×4 close-X all crammed into a single button row, easy
to misclick.

Reorganize into four logical groups, each with a small uppercase
section label:

  Context  — gradient strip (emerald when in a room, zinc when not)
             showing "Room #<id>" or "Enter a room first" with a
             matching door icon. Source of truth for "what is the
             mod observing right now"; both Room Tool and Chatlog
             Tool feed from the same currentRoomId.

  Room     — Room Tool + Chatlog Tool stacked. Both still gate on
             isInRoom; the disabled state now reads from a single
             flag instead of repeating `currentRoomId <= 0`.

  User     — When a user is selected: a card with the presence dot
             (emerald = still in room, zinc = left), the username at
             a real legible size, a bigger close button, plus a
             dedicated "Open Info" button to toggle ModToolsUserView.
             Splitting the click target from the close action removes
             the misclick footgun.
             When no user is selected: a dashed-border empty state
             with a FaUserSlash icon and the "Select a user" hint —
             reads as a clear "no selection" instead of an active
             button you can't press.

  Reports  — Report Tool with the open-ticket badge. Badge gets a 2px
             rose halo box-shadow so a new ticket pulses into view
             instead of competing with the button background.

Locale keys added under modtools.window.section.* and
modtools.window.context.room / modtools.window.user.open_info, in both
the runtime UITexts.json and the versioned UITexts.example template.

The "Open Info" button label is a fix in flight — the old layout
overloaded the username row to also open user info, with no separate
label. The new explicit button gets its own key so the action is
unambiguous (the previous version mislabelled the button as "Mod
Action", which is actually a different sub-panel).

typecheck + vitest 214/214 + JSON validation all clean.

public/configuration/UITexts.example

@@ -124,6 +124,12 @@
     "modtools.window.user.clear":  "Clear selection",
     "modtools.window.tickets.open":  "%count% open ticket",
     "modtools.window.tickets.open.many":  "%count% open tickets",
+    "modtools.window.section.context":  "Context",
+    "modtools.window.section.room":  "Room",
+    "modtools.window.section.user":  "User",
+    "modtools.window.section.reports":  "Reports",
+    "modtools.window.context.room":  "Room #%roomId%",
+    "modtools.window.user.open_info":  "Open Info",
     "modtools.userinfo.refresh":  "Refresh user info",
     "modtools.userinfo.presence.in_room":  "In room",
     "modtools.userinfo.presence.in_room.title":  "In the room you are observing",