PTT fixes, TDS expansions, performance hooks, state event renderers

PTT fixes (BUG-7/8/9):
- BUG-7: Fix isEditable to use ownerDocument.body (works in EC iframe context)
- BUG-8: Release mic if callEmbed changes during active PTT (cleanup fn)
- BUG-9: Wire iframe blur/focus listeners for stuck-mic prevention

PiP bug fix (BUG-11):
- Track prevPipMode ref so position only resets when first entering pip mode,
  not on every callVisible change (user drag position preserved)

GIF improvements (BUG-15):
- Show user-visible error text in toolbar on GIF send failure
- Also surface size-limit rejection with a 4-second auto-clearing message

Performance:
- useInterval: replace useMemo with useEffect for setInterval (React StrictMode safe)
- usePan: add unmount cleanup effect to remove document mousemove/mouseup listeners

Feature: timeline state event renderers (low effort, high value):
- Added renderers for RoomEncryption, RoomJoinRules, RoomGuestAccess, RoomCanonicalAlias
- These were silently falling through to the hidden-events fallback

TDS (Lotus Terminal Design System):
- Fix: correct 8 escaped template literals in GIF picker light-mode block
- Add data-emoji-board attribute to EmojiBoardLayout for stable CSS targeting
- Add Tooltip panel styles (dark + light mode)
- Add Switch toggle styles (dark + light mode)
- Add Spinner stroke colors (dark + light mode)
- Add EmojiBoard panel styles (dark + light mode)
- Add PopOut/Menu/floating panel styles (dark + light mode)

src/app/hooks/usePan.ts

@@ -54,6 +54,13 @@ export const usePan = (active: boolean) => {
     if (!active) setPan(INITIAL_PAN);
   }, [active]);
 
+  // Clean up document listeners if component unmounts during an active drag
+  useEffect(() => () => {
+    document.removeEventListener('mousemove', handleMouseMove);
+    document.removeEventListener('mouseup', handleMouseUp);
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
   return {
     pan,
     cursor,