Timeline: config-driven mute rules; show replies with thread-root context

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DgBEW6qAwgn2fcQbA2f4ZQ

server/scripts/sync-once.ts

@@ -4,7 +4,7 @@ import { runPoll } from '../poller.js';
 import { getLastRateLimit } from '../github/client.js';
 
 const config = loadConfig();
-const db = new Db();
+const db = new Db({ muteRules: config.timeline.mute });
 
 console.log(`search: ${config.searchQuery}\n`);
 const result = await runPoll(config, db);