b045db94

Rotate images by exact degrees in either direction (#10)

## Summary

The Rotate button still turns images 90° clockwise. Its attached dropdown now offers **Exact**, which opens a dialog for degrees and clockwise/counterclockwise direction. Each opening defaults to **90° clockwise**.

- Accept fractional angles and normalize complete turns; canceling or submitting a full turn leaves the image and undo history unchanged.
- Expand the canvas without clipping the rotated image, leaving transparent corners.
- Keep arrows, rectangle outlines, and redactions aligned and independently toggleable/removable through rotation, cropping, and undo.
- Preserve keyboard input, validation, focus restoration, and crop selections when canceling the dialog.
- Keep editor undo working with focused shape checkboxes, while modal controls never undo the image behind the dialog.
- Export transparent corners as white in JPEG, preserve alpha in PNG/WebP/clipboard, and prevent dark fringes when resizing rotated edges.

## Verification

- Full Playwright suite: **29 passed** after review fixes.
- Prettier checks and `git diff --check` passed.
- Inspected desktop (1600px) and narrow (480px) dialog screenshots.
- Tests cover defaults, cancellation, validation, both directions, fractional angles, annotation geometry, undo with focused controls, cropping, PNG download, and clipboard output. Clipboard output uses a stubbed writer to inspect the actual PNG payload.
- Encoding tests cover full-size and resized JPEG backgrounds, PNG/WebP alpha, and partially transparent rotated edges. Regression tests reproduced checkbox undo, black JPEG corners, and dark resized fringes before their fixes.

## Review

Completed Claude's read-only review and collaborative fix/verification loop after initial publication.

- Base: `1d65db2d2fbe1cc9fb32f4eb9ba744bb33b5c222` (`origin/master`).
- Initial reviewed HEAD: `58454d2be9d804dde636e5c991a5c826df4ab44a`.
- Final reviewed HEAD: `6b5237e5dd5bb77144a3c1641aa64eadf85ee589`.
- Implemented agreed undo, crop-interaction, shared-rendering, JPEG-background, and alpha-aware resizing fixes. Removed redundant validation and clarified Undo's image-quality benefit.
- Final reviewer result: **converged; no actionable findings remain**. Deferred only unrelated pre-existing viewport-fit duplication; retained the requested Exact label.

Co-authored-by: Michael Lynch <git@mtlynch.io>
Reviewed-on: https://codefloe.com/mtlynch/pointer-brother/pulls/10

Total

5s

Timeline