fix: Implement proper task deletion in cleanup button

- Add delete_task() method to DownloadManager that removes tasks from the task list
- Modify DELETE endpoint to use delete_task() instead of cancel_download()
- Tasks are now completely removed from the list when cleanup button is clicked

Previously, DELETE only cancelled the download but kept it in the list.
Now cancelled/failed/deleted downloads are permanently removed.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

app/download_manager.py

@@ -75,6 +75,22 @@ class DownloadManager:
             if task.file_path and os.path.exists(task.file_path):
                 os.remove(task.file_path)
 
+    async def delete_task(self, task_id: str):
+        """Completely remove a task from the task list"""
+        task = self.tasks.get(task_id)
+        if task:
+            # Cancel if downloading
+            if task_id in self.active_downloads:
+                self.active_downloads[task_id].cancel()
+                del self.active_downloads[task_id]
+
+            # Delete file if exists
+            if task.file_path and os.path.exists(task.file_path):
+                os.remove(task.file_path)
+
+            # Remove from tasks dict
+            del self.tasks[task_id]
+
     async def _download(self, task: DownloadTask):
         async with self._semaphore:
             try:

main.py

@@ -136,13 +136,13 @@ async def resume_download(task_id: str, background_tasks: BackgroundTasks):
 
 
 @app.delete("/api/download/{task_id}")
-async def cancel_download(task_id: str):
-    """Cancel a download"""
+async def delete_download(task_id: str):
+    """Delete/cancel a download (removes it from the list)"""
     task = download_manager.get_task(task_id)
     if not task:
         raise HTTPException(status_code=404, detail="Task not found")
-    await download_manager.cancel_download(task_id)
-    return {"status": "cancelled"}
+    await download_manager.delete_task(task_id)
+    return {"status": "deleted"}
 
 
 @app.get("/api/download/{task_id}/file")