Create Project modal has no loading feedback

[AakashKB]

Ideally, these create flows should give feedback and create optimistically. I've also navigated to notes during create, and was redirected back to the new project when it was finally created a minute late, which isn't the best UX.

When I initially encountered this bug, it led to rage-clicking the button and a 429.

Steps to reproduce:
** Only noticeable during high server load due to added latency on create

1. User clicks "Create"
2. createBoard.mutateAsync() fires — the button stays enabled with no spinner
3. The API call takes time (network round-trip)
4. During this time the modal looks frozen, user can click away
5. On success, onCreated(boardId) fires → parent calls navigate() → redirect happens
6. If user already navigated elsewhere, the delayed redirect is jarring

Screen.Recording.2026-04-01.at.3.18.40.PM.mov

[AakashKB]

Fixed in #31