feat: Add upload completion hint and increase notification debounce timer

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

app/app.py

@@ -235,7 +235,7 @@ def _schedule_batch_notification():
     asyncio.create_task(send_batch_notification())
 
 async def reset_telegram_debounce():
-    """Resets the 30s timer for batch completion notification."""
+    """Resets the 120s timer for batch completion notification."""
     if not SETTINGS.telegram_bot_api_key or not TELEGRAM_OWNER_ID:
         return
     
@@ -244,7 +244,7 @@ async def reset_telegram_debounce():
         if _batch_complete_timer:
             _batch_complete_timer.cancel()
         loop = asyncio.get_event_loop()
-        _batch_complete_timer = loop.call_later(10, _schedule_batch_notification)
+        _batch_complete_timer = loop.call_later(120, _schedule_batch_notification)
 
 async def add_file_to_batch(filename: str, size: int, album_name: str, is_invite: bool):
     """Adds a completed file to the batch list."""
@@ -1127,6 +1127,17 @@ async def api_upload_chunk_complete(request: Request) -> JSONResponse:
         await send_progress(session_id_local, item_id_local, "error", 100, "Failed to save file locally")
         return JSONResponse({"error": "local_save_failed"}, status_code=500)
 
+@app.post("/api/uploads/batch_complete_hint")
+async def api_batch_complete_hint(request: Request) -> JSONResponse:
+    """
+    Client-side hint that a batch of uploads has completed.
+    This triggers the batch notification immediately instead of waiting for the debounce timer.
+    """
+    # session_id from body is optional, for future use, but not currently used
+    # because the batch is global.
+    await send_batch_notification()
+    return JSONResponse({"ok": True})
+
 
 # ---------- Auth & Albums & Invites APIs ----------