feat(webui): simplify mobile frontend (Option C)

[EstrellaXD]

Summary

• implement the approved mobile-only Option C shell below 640px with Home, Search, and More navigation while preserving desktop routes and layouts
• simplify authenticated mobile pages, Login, and Setup with adaptive sheets, sticky/local actions, keyboard-safe sizing, and explicit focus handoff
• harden root routing, cross-breakpoint overlay/selection state, notification teardown, chained confirmations, and Home downloader summaries
• add hermetic WebKit coverage for mobile auth, setup, shell, search state, offset Escape handoff, dialogs, and breakpoint transitions

Review fixes

Two sequential independent reviews were completed. All confirmed findings were fixed with regression tests, including:

• stale More/notification overlay state across unmounts
• chained dialog and replacement-confirmation focus loss
• Search Escape bypassing the offset-review handoff
• RSS desktop checkbox state after a mobile breakpoint transition
• mobile root redirect and revoked-session navigation races
• missing fake-qB fields producing NaN undefined on Home
• Linux WebKit focus loss after handing off from More to a destructive confirmation

The CI focus follow-up also received a fresh code review and adversarial rescue review; both passed with no P0-P2 findings.

Validation

• pnpm vitest run: 521 passed
• pnpm test:build: passed
• pnpm test:e2e:typecheck: passed after the dependency merge
• pnpm lint: 0 errors (6 pre-existing warnings)
• pnpm build: passed
• fake-qB contract: 5 passed
• production-image WebKit mobile lane: 23 passed
• focused WebKit More focus handoff: 5/5 repeated passes
• affected Chromium auth/session lane: 6 passed
• repeated revoked-session WebKit regression: 21 passed
• Hermetic E2E run 29419862467:
  • Chromium browser lane passed
  • WebKit mobile browser lane passed
  • runtime lane passed
  • downloader-image lane passed
• Build Docker runs 29419862576 and 29419863620:
  • backend tests passed
  • webui tests passed
  • version-info passed
  • release-only jobs skipped as expected for a PR
• Vercel deployment passed

Dependency and rollout

• test(e2e): align standalone movie contract #1080 was reviewed and squash-merged into 3.3-dev as 520873f
• this branch is synchronized with that base at cb7cbcb
• all current PR checks pass: 12 successful, 0 failing, 0 pending; 8 release-only jobs skipped

This PR remains intentionally Draft. No Beta tag or release has been created.

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Project	Deployment	Actions	Updated (UTC)
auto-bangumi	Ready	Preview, Comment	Jul 15, 2026 1:36pm