feat: poll voting, location sharing, image captions, message forwarding

- Poll voting: PollContent sends m.poll.response on answer click
- Location: MLocation shows OSM map embed + share-location button in toolbar
- Image captions: caption field on media uploads sets message body
- Message forwarding: ForwardMessageDialog with searchable room picker
- Also includes ring timeout fix and earlier session patches

src/app/features/room/msgContent.ts

@@ -55,7 +55,7 @@ export const getImageMsgContent = async (
   const content: IContent = {
     msgtype: MsgType.Image,
     filename: file.name,
-    body: file.name,
+    body: metadata.caption?.trim() || file.name,
     [MATRIX_SPOILER_PROPERTY_NAME]: metadata.markedAsSpoiler,
   };
   if (imgEl) {
@@ -90,7 +90,7 @@ export const getVideoMsgContent = async (
   const content: IContent = {
     msgtype: MsgType.Video,
     filename: file.name,
-    body: file.name,
+    body: metadata.caption?.trim() || file.name,
     [MATRIX_SPOILER_PROPERTY_NAME]: metadata.markedAsSpoiler,
   };
   if (videoEl) {