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/message/EditHistoryModal.tsx

@@ -110,21 +110,27 @@ export function EditHistoryModal({ room, mEvent, onClose }: EditHistoryModalProp
       if (!fetchRes.ok) throw new Error(`HTTP ${fetchRes.status}`);
       const res = (await fetchRes.json()) as EditHistoryResponse;
       const rawEvents = res.chunk ?? [];
-      const events = rawEvents
-        .filter(isRawEditEvent)
-        .sort((a, b) => a.origin_server_ts - b.origin_server_ts)
-        .map((raw) => {
-          const existing = room.findEventById(raw.event_id);
-          if (existing) return existing;
-          return new MatrixEvent({
-            type: raw.type,
-            content: raw.content,
-            origin_server_ts: raw.origin_server_ts,
-            event_id: raw.event_id,
-            room_id: roomId,
-            sender: mEvent.getSender() ?? '',
-          });
-        });
+      const events = await Promise.all(
+        rawEvents
+          .filter(isRawEditEvent)
+          .sort((a, b) => a.origin_server_ts - b.origin_server_ts)
+          .map(async (raw) => {
+            const existing = room.findEventById(raw.event_id);
+            if (existing) return existing;
+            const evt = new MatrixEvent({
+              type: raw.type,
+              content: raw.content,
+              origin_server_ts: raw.origin_server_ts,
+              event_id: raw.event_id,
+              room_id: roomId,
+              sender: mEvent.getSender() ?? '',
+            });
+            if (evt.isEncrypted()) {
+              await mx.decryptEventIfNeeded(evt);
+            }
+            return evt;
+          }),
+      );
 
       return { events, hasMore: !!res.next_batch };
     }, [mx, roomId, eventId, room, mEvent]),