feat(meetings): center clock, fullscreen toggle, quick-note tab (#583)

- Replace HeaderClock with richer analog+weekday+digital block, always
  centered in the header (both president and normal views). Drop the
  PresidentClockBar render from the toolbar; the dead helper is left
  in place but unused.
- Lift fullscreen state to ExecutiveMeetingsPageInner with
  sessionStorage persistence, Esc handler, auto-exit when the user
  leaves the schedule tab. Hide the page header when active and show a
  floating "Exit fullscreen" pill. New Maximize/Minimize toggle in the
  schedule toolbar portal.
- Add MeetingsQuickNoteTab: a fixed amber vertical pill pinned to the
  left edge of the schedule view that navigates to /notes?new=1.
- notes.tsx: detect ?new=1, switch to the Active tab, bump a numeric
  openTrigger that the top Composer reacts to by opening + focusing
  the textarea, then scrub the query param so navigation doesn't
  re-trigger.
- i18n: add executiveMeetings.fullscreen.{enter,exit} and
  executiveMeetings.quickNote.label in ar.json and en.json.

tsc clean. Push to Gitea still blocked by Tailscale; user to retry.

artifacts/tx-os/src/pages/notes.tsx

@@ -286,14 +286,10 @@ export default function NotesPage() {
       setView("active");
       // The top Composer is only mounted when
       // `view === "active" && folderSelection.kind !== "shared-folder"`.
-      // If the user arrived from /notes?new=1 while sitting inside a
-      // shared folder, leaving the selection alone would mean the
-      // Composer is never rendered and the open trigger would be lost.
-      // Reset to the default "all" folder so the composer is guaranteed
-      // visible regardless of where they were before.
-      setFolderSelection((cur) =>
-        cur.kind === "shared-folder" ? { kind: "all" } : cur,
-      );
+      // Always land on the default "all" folder so /notes?new=1 has a
+      // deterministic landing state and the composer is guaranteed
+      // mounted regardless of where the user was before.
+      setFolderSelection({ kind: "all" });
       setComposerOpenTrigger((n) => n + 1);
       if (typeof window !== "undefined") {
         params.delete("new");
@@ -3566,10 +3562,14 @@ function Composer({
   };
 
   // External open trigger (e.g. /notes?new=1 from the meetings quick
-  // note tab). Skip the initial mount value (0) and only react to
-  // subsequent bumps, then focus + scroll the textarea into view.
-  const lastOpenTrigger = useRef(openTrigger);
+  // note tab). React both to subsequent bumps AND to the initial mount
+  // when the trigger is already > 0 — this covers the case where the
+  // page resets folder selection and the Composer mounts fresh with a
+  // non-zero trigger (e.g. user was in a shared folder and clicked the
+  // quick-note tab).
+  const lastOpenTrigger = useRef(0);
   useEffect(() => {
+    if (openTrigger === 0) return;
     if (openTrigger === lastOpenTrigger.current) return;
     lastOpenTrigger.current = openTrigger;
     setOpen(true);