feat(gui): implement Phases 2-5 of Comprehensive GUI UX track

- Add cost tracking with new cost_tracker.py module
- Enhance Track Proposal modal with editable titles and goals
- Add Conductor Setup summary and New Track creation form to MMA Dashboard
- Implement Task DAG editing (add/delete tickets) and track-scoped discussion
- Add visual polish: color-coded statuses, tinted progress bars, and node indicators
- Support live worker streaming from AI providers to GUI panels
- Fix numerous integration test regressions and stabilize headless service

gemini_cli_adapter.py

@@ -75,11 +75,12 @@ class GeminiCliAdapter:
      if msg_type == "init":
       if "session_id" in data:
        self.session_id = data.get("session_id")
-     elif msg_type == "message":
+     elif msg_type == "message" or msg_type == "chunk":
      # CRITICAL: Only accumulate content from the assistant/model role.
      # The CLI echoes back the 'user' prompt in the stream, which we must skip.
       role = data.get("role", "")
-      if role in ["assistant", "model"]:
+      # Chunks usually don't have role, so we assume assistant if missing
+      if role in ["assistant", "model"] or not role:
        content = data.get("content", data.get("text"))
        if content:
         accumulated_text += content