test(e2e): enforce unified UI quality contracts

[tiankaima]

What changed

• define a single L0-L4 UI/E2E standard for inventory, rendered-page health, UI quality, stateful interactions, and opt-in visual evidence
• make every rendered route own desktop and mobile coverage, including settings/workspace tabs, error/OAuth states, redirects, and the API docs browser alias
• add shared structural and WCAG A/AA checks for headings, landmarks, links, images, duplicate IDs, console errors, and horizontal overflow
• replace soft-pass interaction tests with deterministic fixtures and explicit empty, moderation, account, and admin assertions
• fix semantic accessibility issues exposed by the new contract without changing visible layout
• keep pixel regression representative and opt-in, per the no-visible-change policy

Why

The previous suite listed all Svelte pages but did not consistently prove mobile coverage, required UI elements, structural accessibility, or deterministic interaction states. Several tests could silently pass when expected controls or fixtures were absent.

Impact

New pages and primary actions must be attached to executable E2E coverage. All rendered pages now share the same baseline UI contract on desktop and mobile. Existing four-shard database isolation remains the safe parallelism boundary for mutable seeded state.

Validation

• 4 isolated Playwright shards: 452 passed, 14 intentionally skipped
• Vitest with coverage: 355 files, 2134 tests passed
• Biome: no errors (7 existing warnings)
• Svelte check: 0 errors (13 existing warnings)
• test TypeScript project: passed
• pixel visual matrix not run; 12 representative cases remain opt-in

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	life-ustc	44e567e	Aug 14 2026, 02:02 PM

[github-actions]

E2E HTML report is ready: https://life-ustc.github.io/e2e-snapshot-artifacts/reports/31807358171/index.html
All reports: https://life-ustc.github.io/e2e-snapshot-artifacts/

[github-actions]

🎉 This PR is included in version 1.90.4 🎉

The release is available on GitHub release

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