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>

src/services/reddit-account-runtime-builder.ts

@@ -13,7 +13,11 @@ import {
   ActivityLogRepository,
   RecipientHistoryRepository,
 } from '../database/repositories.js';
-import { AccountContentRepository, RedditAccountsRepository } from '../database/account-repositories.js';
+import {
+  AccountContentRepository,
+  RedditAccountsRepository,
+  RedditRecipientAccountStatusRepository,
+} from '../database/account-repositories.js';
 import { RedditApiClient, RedditRateLimitError, type RedditPost } from '../reddit/api.js';
 import { RedditRequestCoordinator } from '../reddit/request-coordinator.js';
 import { OpenRouterClient } from '../ai/openrouter.js';
@@ -48,6 +52,7 @@ import { ConversationAutomationService } from './conversation-automation.js';
 import { AiUsageRepository } from '../database/ai-usage-repository.js';
 import { MediaLibraryRepository } from '../database/media-library-repository.js';
 import { MediaLibraryExchangeService } from './media-library-exchange.js';
+import { RecipientAccountStatusService } from './recipient-account-status.js';
 
 export interface ConcreteRuntimeFactoryOptions {
   config: Config;
@@ -212,6 +217,14 @@ async function buildRuntime(
     );
     await chatService.loadCache();
     const mediaSyncService = new MediaSyncService(chatService, logger, accountConfig.media.syncIntervalMs, accountAuth);
+    const recipientAccountStatusRepo = new RedditRecipientAccountStatusRepository(db);
+    const recipientAccountStatusService = new RecipientAccountStatusService(
+      chatService,
+      redditApi,
+      recipientAccountStatusRepo,
+      logger,
+      accountAuth,
+    );
     const responseChecker = new ResponseCheckerService(
       chatPage, messagesRepo, successfulMessagesRepo, postsRepo, logger,
       accountAuth, conversationOutcomesRepo,
@@ -250,10 +263,11 @@ async function buildRuntime(
       browserProfileDir, browserClient, accountAuth, matrixClient, chatCache, redditApi,
       postsRepo, messagesRepo, successfulMessagesRepo, deliveryOutboxRepo,
       conversationStateRepo, conversationReadStateRepo, conversationOutcomesRepo,
-      redditUsersRepo, accountContentRepo,
+      redditUsersRepo, accountContentRepo, recipientAccountStatusRepo,
       activityLogRepo,
       monitorService, processorService, responseChecker, conversationAutomation, chatService, mediaService,
       mediaSyncService, mediaExchange, rateLimiter,
+      recipientAccountStatusService,
     };
     const lifecycle = new AccountRuntimeLoop(
       resources, accountConfig, logger, isBotRunning, recipientDeduplicator,
@@ -293,6 +307,7 @@ class AccountRuntimeLoop {
     if (this.loop) return;
     this.controller = new AbortController();
     this.resources.mediaSyncService.start();
+    this.resources.recipientAccountStatusService.start();
     void this.resources.chatService.runStartupSync()
       .then(() => this.resources.chatService.enrichUsernames())
       .catch((error) => this.logger.error(`[account ${this.resources.accountAuth.getSnapshot().redditUsername}] startup sync failed:`, error));
@@ -302,6 +317,7 @@ class AccountRuntimeLoop {
   async stop(): Promise<void> {
     this.controller?.abort();
     this.resources.mediaSyncService.stop();
+    this.resources.recipientAccountStatusService.stop();
     await this.loop?.catch((error) => {
       if (!(error instanceof DOMException && error.name === 'AbortError')) throw error;
     });