fix(ui): harden mobile layout and accessibility targets

[tiankaima-copilot]

Summary

• contain section-detail content at mobile widths so the comments composer cannot create an inner horizontal pan (ui(section): section detail content overflows the mobile viewport and auto-scrolls sideways #862)
• add short-viewport Todo create/edit regression coverage for bounded dialogs, internal scrolling, and reachable footer/close/calendar controls (ui(todo): todo create/edit dialogs are clipped on short mobile viewports #863)
• lock moderation dialog coverage to one semantic dismiss control (ui(comment): moderation comment dialog renders two Close controls #865)
• make the AppShell main target programmatic-only and give its keyboard-scroll region a distinct accessible name (a11y: appshell exposes duplicate consecutive focus stops for the main content #870)
• apply a 44px mobile hit-area floor through shared Button, Toggle, and InputGroup primitives, retaining compact desktop sizing; cover representative Todo, settings, passkey, dialog, and toolbar controls (ui: core mobile action targets remain 24–32 px outside the shell #871)

Validation

• bunx biome check on all changed source/tests
• bunx svelte-check --tsconfig ./tsconfig.json (0 errors; 5 pre-existing unused-export warnings)
• bunx tsc --noEmit -p tsconfig.typecheck.json
• bunx tsc --noEmit -p tsconfig.typecheck.operational.json
• bunx tsc --noEmit -p tsconfig.typecheck.tests.json
• bunx vitest run (381 files, 2383 tests passed)
• bun run build and bun run openapi:check
• focused Playwright against a fresh migrated/seeded PostgreSQL DB and local Wrangler worker: section 360/390px before/after composer, short-viewport Todo create/edit, moderation dialog, settings preferences/passkey targets, AppShell focus, plus section/moderation/preferences page contracts (axe/UI-quality gate)

The Browser plugin is unavailable in this environment; the repository Playwright flow is the explicit fallback.

Scope notes

• Tablet sidebar issue ui: tablet shell is locked to an icon-only sidebar with no focusable expand control #869 is intentionally untouched pending design choice.
• Draft refactor(ui): use a single-column detail popup #767 remains open because its broader detail-popup hierarchy work is not covered by this batch.

Fixes #862
Fixes #863
Fixes #865
Fixes #870
Fixes #871

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	life-ustc	2eae03c	Aug 27 2026, 01:17 PM

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E2E HTML report is ready: https://life-ustc.github.io/e2e-snapshot-artifacts/reports/33075899126/index.html
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🎉 This PR is included in version 1.94.1 🎉

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