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/useInterval.ts

@@ -1,24 +1,11 @@
-import { useEffect, useMemo } from 'react';
+import { useEffect, useRef } from 'react';
 
 export type IntervalCallback = () => void;
 
-/**
- * @param callback interval callback.
- * @param ms interval time in milliseconds. negative value will stop the interval.
- * @returns interval id or undefined if not running.
- */
-export const useInterval = (callback: IntervalCallback, ms: number): number | undefined => {
-  const id = useMemo(() => {
+export const useInterval = (callback: IntervalCallback, ms: number): void => {
+  useEffect(() => {
     if (ms < 0) return undefined;
-    return window.setInterval(callback, ms);
+    const id = window.setInterval(callback, ms);
+    return () => window.clearInterval(id);
   }, [callback, ms]);
-
-  useEffect(
-    () => () => {
-      window.clearInterval(id);
-    },
-    [id]
-  );
-
-  return id;
 };