fix: instant widget lead assignment + SSE notification

Widget leads were invisible to agents for up to 90s (60s auto-assign
poll + 30s worklist poll). Now triggers immediate auto-assign after
lead creation and emits SSE worklistUpdate so agents see new widget
leads and appointments instantly.

Also excluded packages/ from tsconfig build to prevent widget source
compilation errors.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tsconfig.json

@@ -22,5 +22,5 @@
     "strictBindCallApply": true,
     "noFallthroughCasesInSwitch": true
   },
-  "exclude": ["widget-src", "public", "data"]
+  "exclude": ["widget-src", "packages", "public", "data"]
 }