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## Summary Add 29 unit tests for the `usePanAndZoom` composable to improve mask editor test coverage. ## Changes - **What**: New test file `src/composables/maskeditor/usePanAndZoom.test.ts` covering all public API methods ## Review Focus Test coverage spans: - `initializeCanvasPanZoom` — landscape/portrait fit-to-view, panel width accounting, style application - `handlePanStart`/`handlePanMove` — panning state, offset updates, error on missing start - `zoom` — wheel in/out, clamping (0.2–10.0), missing canvas early return, cursor update - `updateCursorPosition` — pan offset application - `invalidatePanZoom` — missing image warning, store container fallback, rgbCanvas dimension sync - Touch handlers — single/two-finger start, double-tap undo, pen blocking, single-touch pan, pinch zoom, touch end states - `addPenPointerId`/`removePenPointerId` — add, dedup, remove, no-op ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-11391-test-add-unit-tests-for-usePanAndZoom-composable-3476d73d36508104b447d87471ce021b) by [Unito](https://www.unito.io) --------- Co-authored-by: Terry Jia <terryjia88@gmail.com> Co-authored-by: GitHub Action <action@github.com>