Fixes#672
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> Add selectable problem rows with Select all/Clear all and Fix N
selected, and update tests to cover selection behavior.
>
> - **UI (Problems panel)**:
> - Add checkbox selection for each problem row (`ProblemItem`) with row
click-to-toggle, `data-testid="problem-row"`, and accessibility
attributes.
> - Introduce selection state in `_Problems` with auto-select-all on
report load; provide Select all / Clear all controls.
> - Change Fix button to operate on selected problems only, showing
dynamic label `Fix N problem(s)` and disabled when none selected.
> - Wire `RecheckButton` to clear selection before rechecking; minor
hover style tweaks; add `Checkbox` component.
> - **E2E Tests**:
> - New test: selecting specific problems and fixing only selected; add
snapshots for prompt content.
> - Update manual edit tests (React/Vite, Next.js) to assert Fix button
enabled/disabled and counts; remove old ARIA snapshots.
> - Minor import addition for `Timeout` and related expectations.
>
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<!-- /CURSOR_SUMMARY -->
Test cases:
- [x] create-ts-errors
- [x] with auto-fix
- [x] without auto-fix
- [x] create-unfixable-ts-errors
- [x] manually edit file & click recheck
- [x] fix all
- [x] delete and rename case
THINGS
- [x] error handling for checkProblems isn't working as expected
- [x] make sure it works for both default templates (add tests)
- [x] fix bad animation
- [x] change file context (prompt/files)
IF everything passes in Windows AND defensive try catch... then enable
by default
- [x] enable auto-fix by default
