## Why
Task attachment awaits server requests while the event handler cannot process scheduled frames. Prompts and chat widget replacement can also clear the terminal during loading.
## What changed
Draw a bold `Loading task…` message immediately when attaching a task, and redraw it after folder selection, trust prompts, and chat widget replacement. Schedule a frame to restore the normal view afterward.
## Testing
Extend the cold-resume test to verify that a loading message appears before server requests complete, survives widget replacement, and is replaced on the next draw.
GitOrigin-RevId: cb2e73efe38758025964aa53f52127a2b2609fca
