test: record mobile visual viewport scale policy

[Chris0Jeky]

Summary

• extend the existing synthetic mobile VisualViewport harness with scale
• assert a scale-only change preserves the existing keyboard-contracted modal geometry
• keep native pinch transforms and physical-device reachability explicitly outside synthetic CI evidence

Verification

• npx playwright test tests/e2e/mobile-responsive.spec.ts --project=mobile-chrome --grep "card editing modal follows" --reporter=line — 1 passed
• npx playwright test tests/e2e/mobile-responsive.spec.ts --project=mobile-chrome --reporter=line — 7 passed
• npm run typecheck — passed
• npm run build — passed
• npx eslint tests/e2e/mobile-responsive.spec.ts — passed
• git diff --check — passed

Refs #1867

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[Chris0Jeky]

Fresh-context review record (coordinator, 2026-09-06; read-only Opus 5 reviewer over the diff against the merge base; route: the standing D-12 rule for Codex-session PRs — review, fix MEDIUM+ in-PR, merge, disposition comment).

VERDICT: SHIP, nothing fixed in-PR. Recorded for #1867: MEDIUM — the visualScale: 2 assertion echoes the spec's own synthetic stub; no production code reads visualViewport.scale, so the title's "scale policy" is not proven and the geometry poll is tautological for the same reason. LOW — the real pinch-zoom policy is the index.html meta tag (width=device-width, initial-scale=1.0, no maximum-scale/user-scalable=no), which the PR neither asserts nor pins; no WCAG 1.4.4 regression is enshrined. Hunks are disjoint from #2732's in the same file.