Add schedule and unit list templates for project management

- Created `schedule_list.html` to display scheduled actions with execution status, location, and timestamps.
- Implemented buttons for executing and canceling schedules, along with a details view placeholder.
- Created `unit_list.html` to show assigned units with their status, location, model, and session/file counts.
- Added conditional rendering for active sessions and links to view unit and location details.

backend/routers/project_locations.py

@@ -460,8 +460,12 @@ async def get_nrl_files(
     """
     from backend.models import DataFile, RecordingSession
 
-    files = db.query(DataFile).filter_by(
-        location_id=location_id
+    # Join DataFile with RecordingSession to filter by location_id
+    files = db.query(DataFile).join(
+        RecordingSession,
+        DataFile.session_id == RecordingSession.id
+    ).filter(
+        RecordingSession.location_id == location_id
     ).order_by(DataFile.created_at.desc()).all()
 
     # Enrich with session details