Resolves
[FE-4144](https://linear.app/supabase/issue/FE-4144/restore-flow-shows-completion-before-restore-is-actually-done)
## Problem
`RestoringState` treated any `ACTIVE_HEALTHY` reading from the project
status endpoint as "restore finished". Right after a restore is
triggered the backend still reports the pre-restore status, so the first
poll could land on `ACTIVE_HEALTHY` and flip the UI to "Restoration
complete!" seconds into a restore that had barely started. `isCompleted`
was local state nothing reset and polling stopped on that first reading,
so the screen never self-corrected — "Return to project" then hung until
a manual refresh.
## Changes
- Gate completion on having observed the project leave the healthy
state, so a stale pre-restore reading is no longer mistaken for a
finished restore.
- Keep polling through an unconfirmed healthy reading instead of
stopping on it.
- `onConfirm` clears its loading flag rather than relying on the layout
to unmount the component.
- Component tests covering both the premature completion and the stuck
button.
## Needs validation
Not yet verified against a real restore — please confirm on staging
before merging. Worth checking in particular that a restore which
completes normally still reaches the completion screen.
There is one residual edge case left in place deliberately: if the
details endpoint reports `RESTORING` while the status endpoint reports
`ACTIVE_HEALTHY`, the UI now stays on "Restoration in progress" until
the details query catches up. Fixing that properly needs an
authoritative "restore initiated at" timestamp from the API, which does
not exist today.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Bug Fixes**
- Improved project restoration tracking to prevent completion from being
reported prematurely.
- Restoration now correctly detects failures and stops polling when
appropriate.
- Restore status and saved transition information are cleared after
successful completion or failure.
- Confirmation actions now remain reliable while project details
refresh.
- Restoring controls become usable again after the process finishes.
- Improved the restore menu trigger behavior for more consistent
interaction.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Alaister Young <10985857+alaister@users.noreply.github.com>
