fix: recover chat state after idle reconnects

Resyncs active sessions after hidden upstream stream reconnects
Recovers orphaned streaming parts with active-session snapshots
Adds coverage for event-stream reconnect behavior

packages/web/package.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "@clack/prompts": "^1.1.0",
     "@octokit/rest": "^22.0.1",
-    "@opencode-ai/sdk": "^1.17.9",
+    "@opencode-ai/sdk": "^1.17.12",
     "@simplewebauthn/server": "13.3.1",
     "adm-zip": "^0.5.16",
     "better-sqlite3": "^12.10.0",