feat(ui): Implement Track Browser and progress visualization in MMA Dashboard

gui_2.py

@@ -336,6 +336,9 @@ class App:
         agent_tools_cfg = self.project.get("agent", {}).get("tools", {})
         self.ui_agent_tools: dict[str, bool] = {t: agent_tools_cfg.get(t, True) for t in AGENT_TOOL_NAMES}
 
+        # MMA Tracks
+        self.tracks: list[dict] = []
+
         # Prior session log viewing
         self.is_viewing_prior_session = False
         self.prior_session_entries: list[dict] = []
@@ -762,6 +765,9 @@ class App:
         agent_tools_cfg = proj.get("agent", {}).get("tools", {})
         self.ui_agent_tools = {t: agent_tools_cfg.get(t, True) for t in AGENT_TOOL_NAMES}
 
+        # MMA Tracks
+        self.tracks = project_manager.get_all_tracks(self.ui_files_base_dir)
+
         # Restore MMA state
         mma_sec = proj.get("mma", {})
         self.ui_epic_input = mma_sec.get("epic", "")
@@ -790,6 +796,40 @@ class App:
             if track_history:
                 self.disc_entries = _parse_history_entries(track_history, self.disc_roles)
 
+    def _cb_load_track(self, track_id: str):
+        state = project_manager.load_track_state(track_id, self.ui_files_base_dir)
+        if state:
+            try:
+                # Convert list[Ticket] or list[dict] to list[Ticket] for Track object
+                tickets = []
+                for t in state.tasks:
+                    if isinstance(t, dict):
+                        tickets.append(Ticket(**t))
+                    else:
+                        tickets.append(t)
+                
+                self.active_track = Track(
+                    id=state.metadata.id,
+                    description=state.metadata.name,
+                    tickets=tickets
+                )
+                # Keep dicts for UI table (or convert Ticket objects back to dicts if needed)
+                from dataclasses import asdict
+                self.active_tickets = [asdict(t) if not isinstance(t, dict) else t for t in tickets]
+                
+                # Load track-scoped history
+                history = project_manager.load_track_history(track_id, self.ui_files_base_dir)
+                if history:
+                    self.disc_entries = _parse_history_entries(history, self.disc_roles)
+                else:
+                    self.disc_entries = []
+                
+                self._recalculate_session_usage()
+                self.ai_status = f"Loaded track: {state.metadata.name}"
+            except Exception as e:
+                self.ai_status = f"Load track error: {e}"
+                print(f"Error loading track {track_id}: {e}")
+
     def _save_active_project(self):
         if self.active_project_path:
             try:
@@ -2752,7 +2792,36 @@ class App:
         )
 
     def _render_mma_dashboard(self):
-        # 1. Global Controls
+        # 1. Track Browser
+        imgui.text("Track Browser")
+        if imgui.begin_table("mma_tracks_table", 4, imgui.TableFlags_.borders | imgui.TableFlags_.row_bg | imgui.TableFlags_.resizable):
+            imgui.table_setup_column("Title")
+            imgui.table_setup_column("Status")
+            imgui.table_setup_column("Progress")
+            imgui.table_setup_column("Actions")
+            imgui.table_headers_row()
+
+            for track in self.tracks:
+                imgui.table_next_row()
+                imgui.table_next_column()
+                imgui.text(track.get("title", "Untitled"))
+                
+                imgui.table_next_column()
+                imgui.text(track.get("status", "unknown"))
+                
+                imgui.table_next_column()
+                progress = track.get("progress", 0.0)
+                imgui.progress_bar(progress, imgui.ImVec2(-1, 0), f"{int(progress*100)}%")
+                
+                imgui.table_next_column()
+                if imgui.button(f"Load##{track.get('id')}"):
+                    self._cb_load_track(track.get("id"))
+            
+            imgui.end_table()
+
+        imgui.separator()
+
+        # 2. Global Controls
         changed, self.mma_step_mode = imgui.checkbox("Step Mode (HITL)", self.mma_step_mode)
         if changed:
             # We could push an event here if the engine needs to know immediately