Post-merge fixes: remove duplicate IncomingCallNotification, restore PiP touch drag + grip dots, show redacted message content

- Router.tsx: remove IncomingCallNotification (CallEmbedProvider.IncomingCallListener now handles all calls)
- CallEmbedProvider: restore touch drag (handlePipTouchStart), grip dots on resize handles, fix normaliseToTopLeft width/height
- FallbackContent/MsgTypeRenderers: add originalBody prop to show struck-through original text on deleted messages
- RoomTimeline: cache text message bodies so they can be shown after redaction

src/app/pages/Router.tsx

@@ -69,7 +69,6 @@ import { CreateSpaceModalRenderer } from '../features/create-space';
 import { SearchModalRenderer } from '../features/search';
 import { getFallbackSession } from '../state/sessions';
 import { CallStatusRenderer } from './CallStatusRenderer';
-import { IncomingCallNotification } from '../components/IncomingCallNotification';
 import { CallEmbedProvider } from '../components/CallEmbedProvider';
 
 export const createRouter = (clientConfig: ClientConfig, screenSize: ScreenSize) => {
@@ -138,7 +137,6 @@ export const createRouter = (clientConfig: ClientConfig, screenSize: ScreenSize)
                           <Outlet />
                         </ClientLayout>
                         <CallStatusRenderer />
-                        <IncomingCallNotification />
                       </CallEmbedProvider>
                       <SearchModalRenderer />
                       <UserRoomProfileRenderer />