feat(image-editor): live Navigator panel thumbnail#96
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The PixelForge prototype shows the Navigator panel as functional; toolbox had it as a stub (empty box + zoom %). Render a live composite thumbnail of the document into the panel via renderEditorToCanvas (the same helper the editor uses), down-fit (letterboxed) into a fixed preview box; re-paints on image/state/zoom changes. Shows a placeholder line before an image is opened. i18n: pages.imageEditor.navigator.empty in en + zh-CN. Verified: typecheck/lint/build clean, 388 tests green, i18n parity intact; headless-Chrome confirmed the navigator tab renders a non-blank composite thumbnail (11.8k non-blank px), zero page errors. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
The PixelForge prototype shows the Navigator panel as functional; toolbox had it as a stub (empty box + zoom %). It now renders a live composite thumbnail of the document.
How
NavigatorStub(RightSidebar) now takesimage / state / imageCacheand paints the editor composite (via the existingrenderEditorToCanvashelper) into a fixed-height preview box, letterboxed. Re-paints on image/state/zoom changes. Shows a placeholder line before an image is open.pages.imageEditor.navigator.emptyin en + zh-CN.Verification
pnpm typecheck/pnpm lint/pnpm buildclean; 388 tests green; i18n parity intact (0 gaps).Follows #95 (the prototype's placeholder layer ops). Together these turn the prototype's last "functional-looking but stubbed" surfaces real, except the items deliberately deferred there (Fade — architecturally redundant given non-destructive adjustment layers; vector mask — large render rework).
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