feat(messages): reply quotes show a media thumbnail (#151)

A reply to an image, video or sticker used to quote just the filename.
The quote (timeline) and the composer's reply-draft preview now carry a
36 px thumbnail from the event's own thumbnail, decrypted for E2EE media
via the same hook the gallery uses — never the full-size file. Clicking
still jumps to the original.

useDecryptedMediaUrl and getThumbMxc moved out of MediaGallery into
hooks/ and utils/ so components/message can use them without a cycle.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/features/room/RoomInput.tsx

@@ -96,6 +96,7 @@ import {
 } from '../../state/upload';
 import { getImageUrlBlob, loadImageElement } from '../../utils/dom';
 import { filesToUploadItems } from '../../utils/uploadItems';
+import { ReplyMediaThumb, hasReplyMedia } from '../../components/message/ReplyMediaThumb';
 import { fulfilledPromiseSettledResult } from '../../utils/common';
 import { useSetting } from '../../state/hooks/settings';
 import { useAlive } from '../../hooks/useAlive';
@@ -225,6 +226,8 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
     const [msgDraft, setMsgDraft] = useAtom(roomIdToMsgDraftAtomFamily(draftKey));
     const [replyDraft, setReplyDraft] = useAtom(roomIdToReplyDraftAtomFamily(draftKey));
     const replyUserID = replyDraft?.userId;
+    // [Gitea #151] The quoted event, for a media thumbnail in the draft preview.
+    const replyDraftEvent = replyDraft ? room.findEventById(replyDraft.eventId) : undefined;
 
     const powerLevelTags = usePowerLevelTags(room, powerLevels);
     const creatorsTag = useRoomCreatorsTag();
@@ -1159,9 +1162,14 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
                         </Text>
                       }
                     >
-                      <Text size="T300" truncate>
-                        {trimReplyFromBody(replyDraft.body)}
-                      </Text>
+                      <Box alignItems="Center" gap="200" style={{ minWidth: 0 }}>
+                        {replyDraftEvent && hasReplyMedia(replyDraftEvent) && (
+                          <ReplyMediaThumb mEvent={replyDraftEvent} />
+                        )}
+                        <Text size="T300" truncate>
+                          {trimReplyFromBody(replyDraft.body)}
+                        </Text>
+                      </Box>
                     </ReplyLayout>
                   </Box>
                 </Box>