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Implements the two deferred a11y stretch goals from #1361 / PR #1378. ## What 1. **Brettel/Vienot 1997 dichromatic simulation overlay** — `public/index.html` ships inline `<svg>` defs with `<filter id="cb-deut|cb-prot|cb-trit|cb-achromat">` using `feColorMatrix`. Activation rule: `body[data-cb-sim="X"] { filter: url(#cb-X); }`. `public/customize-v2.js` renders a radio group (off/deut/prot/trit/achromat) under the existing CB preset section. Preview-only — **not persisted**, per the issue spec. 2. **Reset to default Wong button** — `data-cv2-cb-reset` button that calls `MeshCorePresets.applyPreset('default')` and removes `localStorage["meshcore-cb-preset"]`. Two helpers exposed on `window._customizerV2` for unit-test drive: `applyCbSim(id)` and `resetCbPreset()`. ## TDD (red → green) - **Red:** `49155723` — `test-issue-1380-cb-sim-overlay.js` + `test-issue-1380-cb-reset-button.js`. Both load `customize-v2.js` and (for reset) `cb-presets.js` in a vm sandbox; failure is assertion (not compile). - **Green:** `5d8f3c1f` — both tests pass (21 + 7 assertions). ## Files changed - `public/index.html` — inline SVG `<defs>` + 4-rule `<style>` block. - `public/customize-v2.js` — render fns `_renderCbSimSelector` + `_renderCbResetButton`, change/click handlers, helper exports. - `test-issue-1380-cb-sim-overlay.js` (new) — string-asserts on index.html SVG filters / CSS rules / customize-v2 hooks + vm.createContext drive of `applyCbSim`. - `test-issue-1380-cb-reset-button.js` (new) — vm.createContext seeds `meshcore-cb-preset=trit`, calls `resetCbPreset()`, asserts storage cleared + `body[data-cb-preset="default"]`. - `test-all.sh` + `.github/workflows/deploy.yml` — register both tests. ## Out of scope - No new preset palettes (locked from MVP). - No persistence for the sim overlay (preview-only per spec — `localStorage` intentionally untouched by sim radio). - No colorblind-sim JS library — pure inline SVG `feColorMatrix`. Browser verified: filter rule matches via CSS sandbox; visual confirmation deferred to operator (single-tab radio, no fetch). E2E DOM assertion lives in the cv2 vm tests. Fixes #1380 --------- Co-authored-by: openclaw-bot <bot@openclaw.local>