refactor(ui): deepen homework, admin, and schedule hierarchy

[tiankaima-copilot]

Summary

• simplify homework detail and editor hierarchy, make section context required/explicit, and group secondary settings
• widen and unify admin workspaces, data tables, and mobile lists for 4K through mobile
• replace duplicated mobile schedule cards with one dense, horizontally scrollable table implementation

Visual QA

• Playwright fallback used because the Browser plugin is unavailable
• checked 3840x2160 admin and homework surfaces, 1440x900 homework dialogs, and 390x844 section calendar
• verified page identity, meaningful content, no framework overlays, no relevant console errors, and target interactions

Validation

• svelte-check: 0 errors, 0 warnings
• Vitest: 385 files, 2405 tests passed
• production build passed
• targeted Playwright UI tests: 9 passed
• Biome and git diff --check passed

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	life-ustc	639d668	Aug 27 2026, 01:41 PM

[github-actions]

E2E HTML report is ready: https://life-ustc.github.io/e2e-snapshot-artifacts/reports/33077973143/index.html
All reports: https://life-ustc.github.io/e2e-snapshot-artifacts/

[tiankaima-copilot]

Resolved the deterministic failures from run 33076297766. All three failing shards reported scrollable-region-focusable for the new calendar/exam table containers. Commit 639d668 now supplies the shared table primitive with accessible region labels (which gives the overflowing containers keyboard focus), preserves #945’s exam heading label during the main-branch merge, and adds a direct mobile regression for role/tabindex/label. Combined svelte-check and production build pass locally; the full rerun is in progress.

[github-actions]

🎉 This PR is included in version 1.95.0 🎉

The release is available on GitHub release

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