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/components/message/content/FallbackContent.tsx

@@ -4,11 +4,13 @@ import React from 'react';
 const warningStyle = { color: color.Warning.Main, opacity: config.opacity.P300 };
 const criticalStyle = { color: color.Critical.Main, opacity: config.opacity.P300 };
 
-export const MessageDeletedContent = as<'div', { children?: never; reason?: string }>(
-  ({ reason, ...props }, ref) => (
+export const MessageDeletedContent = as<'div', { children?: never; reason?: string; originalBody?: string }>(
+  ({ reason, originalBody, ...props }, ref) => (
     <Box as="span" alignItems="Center" gap="100" style={warningStyle} {...props} ref={ref}>
       <Icon size="50" src={Icons.Delete} />
-      {reason ? (
+      {originalBody ? (
+        <s>{originalBody.length > 80 ? `${originalBody.slice(0, 80)}…` : originalBody}</s>
+      ) : reason ? (
         <i>This message has been deleted. {reason}</i>
       ) : (
         <i>This message has been deleted</i>