Draft restore overwrites live textarea input on Blazor re-render

[PureWeen]

Problem

When Blazor re-renders (triggered by OnStateChanged), the draft restore system (restoreDraftsAndFocus) can overwrite whatever the user is currently typing with a stale draft from draftBySession.

Steps to reproduce

1. Send a message (e.g., /prompt use PR Review -- 559) in a session
2. The message is sent and the textarea clears
3. Type a new message
4. A Blazor re-render fires (from any state change)
5. The textarea is overwritten with the OLD message (/prompt use PR Review -- 559)

Root cause

draftBySession retains the old draft text. The JS-side __liveDrafts mechanism captures live input and merges it before restore, but there's a race window: if the render happens between send (textarea cleared) and the next input event, the stale draft wins.

Relevant code

• PolyPilot/wwwroot/index.html:687-787 — restoreDraftsAndFocus
• PolyPilot/Components/Pages/Dashboard.razor:1167-1175,1209-1231 — draft save/restore