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

tests/visual_sim_gui_ux.py

@@ -0,0 +1,59 @@
+import pytest
+import time
+import sys
+import os
+
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+
+from api_hook_client import ApiHookClient
+
+@pytest.mark.integration
+@pytest.mark.timeout(60)
+def test_gui_ux_event_routing(live_gui) -> None:
+    client = ApiHookClient()
+    assert client.wait_for_server(timeout=15), "Hook server did not start"
+
+    # ------------------------------------------------------------------
+    # 1. Verify Streaming Event Routing
+    # ------------------------------------------------------------------
+    print("[SIM] Testing Streaming Event Routing...")
+    stream_id = "Tier 3 (Worker): T-SIM-001"
+    
+    # We use push_event which POSTs to /api/gui with action=mma_stream_append
+    # As defined in App._process_pending_gui_tasks
+    client.push_event('mma_stream_append', {'stream_id': stream_id, 'text': 'Hello '})
+    time.sleep(0.5)
+    client.push_event('mma_stream_append', {'stream_id': stream_id, 'text': 'World!'})
+    time.sleep(1.0)
+    
+    status = client.get_mma_status()
+    streams = status.get('mma_streams', {})
+    assert streams.get(stream_id) == 'Hello World!', f"Streaming failed: {streams.get(stream_id)}"
+    print("[SIM] Streaming event routing verified.")
+
+    # ------------------------------------------------------------------
+    # 2. Verify State Update (Usage/Cost) Routing
+    # ------------------------------------------------------------------
+    print("[SIM] Testing State Update Routing...")
+    usage = {
+        "Tier 1": {"input": 1000, "output": 500, "model": "gemini-3.1-pro-preview"},
+        "Tier 2": {"input": 2000, "output": 1000, "model": "gemini-3-flash-preview"}
+    }
+    
+    client.push_event('mma_state_update', {
+        'status': 'simulating',
+        'tier_usage': usage,
+        'tickets': []
+    })
+    time.sleep(1.0)
+    
+    status = client.get_mma_status()
+    assert status.get('mma_status') == 'simulating'
+    # The app merges or replaces usage. Let's check what we got back.
+    received_usage = status.get('mma_tier_usage', {})
+    assert received_usage.get('Tier 1', {}).get('input') == 1000
+    assert received_usage.get('Tier 2', {}).get('model') == 'gemini-3-flash-preview'
+    print("[SIM] State update routing verified.")
+
+if __name__ == "__main__":
+    pass