Blur gallery images by default, sync progress UI, and add chat/monitor tests

- Blur NSFW media gallery images until hover/reveal
- Surface chat sync progress in the dashboard header
- Extend chat service, cache, and monitor with delta-media handling
- Add tests for chat cooldown, delta media, and monitor flows

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/web/server.ts

@@ -71,6 +71,10 @@ export class WebServer {
         jitterMs: config.rateLimit.jitterMs,
       },
       browser: { dryRun: config.browser.dryRun },
+      reddit: {
+        prioritizeRecentPosts: config.reddit.prioritizeRecentPosts,
+        recentWindowMinutes: config.reddit.recentWindowMinutes,
+      },
     };
     this.app = express();
     this.setupRoutes();