Fix three open bugs from LOTUS_BUGS.md

- EditHistoryModal: decrypt fetched edit events in E2EE rooms via
  mx.decryptEventIfNeeded() before rendering; previously events not
  found in the room cache showed ciphertext or "(no text)"
- CallEmbedProvider: add touch support for PiP resize corners;
  extracted shared applyResize() helper; onTouchStart wired to all
  four corners alongside existing onMouseDown
- RoomView: skip chatBgStyle when glassmorphism is active; document.body
  already carries the background for the blur effect, rendering it twice
  doubled CSS animation work unnecessarily

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/room/RoomView.tsx

@@ -62,6 +62,7 @@ export function RoomView({ eventId }: { eventId?: string }) {
   const [chatBackground] = useSetting(settingsAtom, 'chatBackground');
   const [lotusTerminal] = useSetting(settingsAtom, 'lotusTerminal');
   const [pauseAnimations] = useSetting(settingsAtom, 'pauseAnimations');
+  const [glassmorphismSidebar] = useSetting(settingsAtom, 'glassmorphismSidebar');
   const theme = useTheme();
   const isDark = theme.kind === ThemeKind.Dark;
 
@@ -97,14 +98,19 @@ export function RoomView({ eventId }: { eventId?: string }) {
     ),
   );
 
+  // When glassmorphism is active, document.body already carries the background so the
+  // sidebar blur has something to work through. Skip applying it here to avoid running
+  // the same CSS animation twice (one per layer = double GPU work).
   const chatBgStyle = useMemo(
     () =>
-      getChatBg(
-        lotusTerminal && chatBackground === 'none' ? 'tactical' : chatBackground,
-        isDark,
-        pauseAnimations,
-      ),
-    [chatBackground, lotusTerminal, isDark, pauseAnimations],
+      glassmorphismSidebar
+        ? {}
+        : getChatBg(
+            lotusTerminal && chatBackground === 'none' ? 'tactical' : chatBackground,
+            isDark,
+            pauseAnimations,
+          ),
+    [chatBackground, lotusTerminal, isDark, pauseAnimations, glassmorphismSidebar],
   );
 
   return (