style: Enhance team member photo handling and ensure fallback members are displayed when no team members are available

Website/main.py

@@ -126,8 +126,16 @@ def _save_team_photo(file_obj, identifier: str) -> str | None:
     if not _is_allowed_image_filename(original_name):
         return None
     os.makedirs(TEAM_UPLOAD_DIR, exist_ok=True)
-    extension = os.path.splitext(original_name)[1].lower() or ".jpg"
+    # If a photo for this identifier already exists, keep the first one and return it.
     safe_identifier = secure_filename(identifier or "member")
+    try:
+        for existing in sorted(os.listdir(TEAM_UPLOAD_DIR)):
+            if existing.startswith(f"team_{safe_identifier}_"):
+                return f"uploads/team/{existing}"
+    except Exception:
+        # If listing fails for any reason, proceed to save new file.
+        pass
+    extension = os.path.splitext(original_name)[1].lower() or ".jpg"
     unique_name = f"team_{safe_identifier}_{datetime.utcnow().strftime('%Y%m%d%H%M%S')}{extension}"
     target = os.path.join(TEAM_UPLOAD_DIR, unique_name)
     file_obj.save(target)