feat: recover missing conversations, fix media attachment, add manual inbox tab

Missing conversations: recipient Reddit accounts that are deleted or suspended
left conversations unaccounted for. A new RecipientAccountStatusService polls
Reddit for the users behind cached conversations and records their account
status durably, with progressive backfill and delta-media fixes in ChatService
so history and images are no longer dropped mid-sync.

Media: attachMedia now surfaces download failures as MediaAttachmentError so the
sync cursor can be retried instead of silently losing an image, recognizes image
bytes when Matrix returns a generic content type, and keeps separate gallery
occurrences when the same asset appears in more than one event.

Manual inbox tab: the conversations list now carries the reply-loop status, so
the inbox can separate conversations the operator is driving by hand from the
ones automation is still handling. A Manual filter pill and a per-row chip
explain why each conversation was handed over.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/web/conversations-route.test.ts

@@ -44,7 +44,14 @@ describe('conversations route', () => {
     });
     const runtime = (accountId: string, redditUsername: string, conversationUsername: string) => ({
       session: { accountId, redditUsername },
-      resources: { chatService: { getCachedConversations: vi.fn().mockResolvedValue([chat(conversationUsername)]) } },
+      resources: {
+        chatService: { getCachedConversations: vi.fn().mockResolvedValue([chat(conversationUsername)]) },
+        recipientAccountStatusRepo: {
+          get: vi.fn((username: string) => username === 'alice'
+            ? { username, status: 'deleted', checkedAt: 123 }
+            : null),
+        },
+      },
     });
     const runtimes = new Map([
       ['@t2_one:reddit.com', runtime('@t2_one:reddit.com', 'owner-one', 'alice')],
@@ -67,7 +74,11 @@ describe('conversations route', () => {
 
     expect(body).toHaveLength(2);
     expect(body).toEqual(expect.arrayContaining([
-      expect.objectContaining({ roomId: 'same-room', username: 'alice', owner: { accountId: '@t2_one:reddit.com', redditUsername: 'owner-one' } }),
+      expect.objectContaining({
+        roomId: 'same-room', username: 'alice', needsReply: false,
+        recipientAccountStatus: 'deleted', recipientAccountStatusCheckedAt: 123,
+        owner: { accountId: '@t2_one:reddit.com', redditUsername: 'owner-one' },
+      }),
       expect.objectContaining({ roomId: 'same-room', username: 'bob', owner: { accountId: '@t2_two:reddit.com', redditUsername: 'owner-two' } }),
     ]));
   });
@@ -319,7 +330,7 @@ describe('conversations route', () => {
       services: {
         chat: { getCachedConversations: vi.fn().mockResolvedValue([conversation]) },
         conversationState: {
-          get: vi.fn(() => ({ sellerDetected: true })),
+          get: vi.fn(() => ({ ...buildConversationState([]), sellerDetected: true })),
         },
       },
     } as unknown as WebContext;
@@ -329,7 +340,57 @@ describe('conversations route', () => {
 
     expect(response.status).toBe(200);
     expect(await response.json()).toEqual([
-      { ...conversation, ...UNREAD_INBOUND_TRIAGE, sellerDetected: true },
+      {
+        ...conversation,
+        ...UNREAD_INBOUND_TRIAGE,
+        sellerDetected: true,
+        automationStatus: 'active',
+        automationPolicyMode: 'legacy',
+        automationHandoffReason: null,
+      },
+    ]);
+  });
+
+  it('projects the reply-loop status onto the list so manual conversations can be filtered', async () => {
+    const automated = {
+      username: 'alice', roomName: 'alice', roomId: 'room-alice',
+      lastMessageTime: 1, lastMessageSnippet: 'hey', isFromUs: false, unread: true,
+    };
+    const manual = {
+      username: 'bob', roomName: 'bob', roomId: 'room-bob',
+      lastMessageTime: 2, lastMessageSnippet: 'thanks', isFromUs: true, unread: false,
+    };
+    const untouched = {
+      username: 'carol', roomName: 'carol', roomId: 'room-carol',
+      lastMessageTime: 3, lastMessageSnippet: 'hi', isFromUs: false, unread: true,
+    };
+    const handedOver = { ...buildConversationState([]) };
+    handedOver.automation.status = 'user-overridden';
+    handedOver.automation.handoffReason = 'A manual reply was sent in this conversation.';
+    const context = {
+      logger: { error: vi.fn() },
+      services: {
+        chat: { getCachedConversations: vi.fn().mockResolvedValue([automated, manual, untouched]) },
+        conversationState: {
+          get: vi.fn((roomId: string) => {
+            if (roomId === 'room-alice') return buildConversationState([]);
+            if (roomId === 'room-bob') return handedOver;
+            return undefined;
+          }),
+        },
+      },
+    } as unknown as WebContext;
+    const app = express().use('/api', createConversationsRouter(context));
+
+    const response = await request(app, '/api/conversations');
+
+    expect(response.status).toBe(200);
+    const body = await response.json() as Array<Record<string, unknown>>;
+    expect(body.map((item) => [item.username, item.automationStatus, item.automationHandoffReason])).toEqual([
+      ['alice', 'active', null],
+      ['bob', 'user-overridden', 'A manual reply was sent in this conversation.'],
+      // Never through the reply loop, so there is nothing to report.
+      ['carol', undefined, undefined],
     ]);
   });