feat(reports): per-NRL Data Files tab reaches parity with the project-wide tab

The per-NRL Data Files tab now reuses the same FTP browser + unified-files partials as the project-wide tab, scoped to the one NRL: ftp-browser and files-unified take an optional location_id. nrl_detail.html drops the flat file_list view for 'Download Files from SLMs' (Browse Files -> Download & Save) plus the grouped 'Project Files' view (edit times / download-all / delete), keeping the NRL upload and adding a refresh button.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/routers/projects.py

@@ -1591,24 +1591,32 @@ async def get_sessions_calendar(
 async def get_ftp_browser(
     project_id: str,
     request: Request,
+    location_id: Optional[str] = None,
     db: Session = Depends(get_db),
 ):
     """
     Get FTP browser interface for downloading files from assigned SLMs.
     Returns HTML partial with FTP browser. Sound Monitoring projects only.
+
+    When `location_id` is given, scope to just the unit(s) assigned to that NRL
+    (used by the per-NRL Data Files tab, which mirrors the project-wide tab).
     """
     from backend.models import DataFile
 
     project = db.query(Project).filter_by(id=project_id).first()
     _require_module(project, "sound_monitoring", db)
 
-    # Get all assignments for this project (active = assigned_until IS NULL)
-    assignments = db.query(UnitAssignment).filter(
+    # Active assignments for this project (active = assigned_until IS NULL),
+    # optionally scoped to a single NRL/location.
+    q = db.query(UnitAssignment).filter(
         and_(
             UnitAssignment.project_id == project_id,
             UnitAssignment.assigned_until == None,
         )
-    ).all()
+    )
+    if location_id:
+        q = q.filter(UnitAssignment.location_id == location_id)
+    assignments = q.all()
 
     # Enrich with unit and location details
     units_data = []
@@ -1882,21 +1890,26 @@ async def ftp_download_folder_to_server(
 async def get_unified_files(
     project_id: str,
     request: Request,
+    location_id: Optional[str] = None,
     db: Session = Depends(get_db),
 ):
     """
     Get unified view of all files in this project.
     Groups files by recording session with full metadata.
     Returns HTML partial with hierarchical file listing.
+
+    When `location_id` is given, scope to a single NRL/location (used by the
+    per-NRL Data Files tab so it mirrors the project-wide tab).
     """
     from backend.models import DataFile
     from pathlib import Path
     import json
 
-    # Get all sessions for this project
-    sessions = db.query(MonitoringSession).filter_by(
-        project_id=project_id
-    ).order_by(MonitoringSession.started_at.desc()).all()
+    # Sessions for this project (optionally scoped to one NRL/location)
+    q = db.query(MonitoringSession).filter_by(project_id=project_id)
+    if location_id:
+        q = q.filter(MonitoringSession.location_id == location_id)
+    sessions = q.order_by(MonitoringSession.started_at.desc()).all()
 
     sessions_data = []
     for session in sessions: