fix: mtime filter + lightbox navigation (arrows, swipe, keyboard)

backend/api/admin_gallery_api.py

@@ -66,15 +66,26 @@ async def admin_get_photos(
     photos = [p for p in all_photos if _is_image(p)]
 
     # Enrichit chaque photo avec mtime depuis le disque
+    # Indexe par stem ET par nom complet pour couvrir les deux formats d'id
     mtime_index: dict[str, float] = {}
-    if media_dir.exists():
-        for f in media_dir.iterdir():
-            mtime_index[f.stem] = f.stat().st_mtime
+    for media_dir_candidate in [
+        media_dir,
+        Path("/home/pi/photobooth-data/media/processed_full"),
+        Path("/home/pi/photobooth-data/media"),
+    ]:
+        if media_dir_candidate.exists():
+            for f in media_dir_candidate.iterdir():
+                if f.is_file():
+                    mt = f.stat().st_mtime
+                    mtime_index[f.name] = mt   # uuid.jpg
+                    mtime_index[f.stem] = mt   # uuid
+            break
 
     for p in photos:
         pid = _get_id(p)
         p["photo_id"] = pid
-        mt = mtime_index.get(pid, 0.0)
+        stem = pid.rsplit(".", 1)[0] if "." in pid else pid
+        mt = mtime_index.get(pid) or mtime_index.get(stem) or 0.0
         p["mtime"] = mt
         p["date_iso"] = datetime.fromtimestamp(mt).strftime("%Y-%m-%d") if mt else ""
         p["date_label"] = datetime.fromtimestamp(mt).strftime("%d/%m/%Y %H:%M") if mt else ""