Round 4-7 tests: 7 LLM scenarios + 10 Playwright UI tests

LLM e2e scenarios (S19-S25):
  S19 — permissions matrix (viewer vs owner across two sets). Flags a
        design mismatch: viewer role currently permits tags/favorites/
        notes via verifyAccess instead of verifyModifyAccess, contrary
        to the model.RoleViewer doc comment. Not fixed; documented.
  S20 — HTTP Range and HEAD on /stream, /download, /thumbnail. Flags
        no-ETag (cacheability gap) and locks in stdlib Range semantics
        (single, suffix, open, 416, multi-range).
  S21 — upload negatives (missing parts, bad extension, traversal,
        404, 403, dedup collisions, 413 skip note).
  S22 — share expiry (sqlite UPDATE on expires_at, then verify 410 on
        all three /s/{token}/... routes) + 5-token uniqueness via
        crypto/rand audit.
  S23 — user deletion cascade with schema audit: every user FK has
        ON DELETE CASCADE; tags are global by design.
  S24 — soft-delete persistence across rescan. Surfaces TWO real bugs
        in scanner: (1) re-INSERT of soft-deleted media hits UNIQUE
        constraint and fails the scan; (2) files deleted from disk
        leave orphan media rows that never get reconciled.
  S25 — SQL injection + XSS + path-traversal probes. SQL surface
        fully parameterised (audited repository/media.go); XSS storage
        is API-correct (UI escapes); share path traversal blocked by
        Go ServeMux path cleaning.

Playwright e2e-web extensions (Round 7, 10 new tests):
  share-page.test.ts (4) — share metadata payload, audio/video stage
    elements, invalid-token 404 page.
  search-filter.test.ts (3) — search filter, like:1 favourites syntax,
    clearing input restores full grid.
  admin-panel.test.ts (3) — user list, permissions section, rescan
    button + scan-progress UI.

Round 8 audit (Android): 24/24 Flutter widget tests pass; the app is
currently a stub with UnimplementedError-only API client, so no
additional test scaffolding is justified until production code lands.

Verified: 25/25 LLM scenarios pass; 22/22 Playwright tests pass; full
Go unit-test suite green.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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