Davy7/25/2026, 12:50:45 AM

* feat(model): consume the openkara-models stable catalog with installed identity

Implements #167: model URLs, digests, and versions now come from the
openkara-models two-layer catalog (stable pointer + immutable release
manifest) instead of hand-maintained constants.

Rust:
- Add separator::catalog — typed pointer/manifest parsing, byte-level
  verification (size + SHA-256 before parse), structural validation
  (unique artifact ids, HTTPS URLs, waveform tensor interface, non-empty
  reciprocal runtime compatibility), and monotonic-generation enforcement.
- Embed a verbatim snapshot of catalog generation 3 as the offline trust
  anchor; descriptors resolve from it with no network and no config.
- Record installed identity (<model>.identity.json) on every verified
  install; readiness accepts pin-matching or identity-verified files so a
  model from a newer generation stays usable offline or under an older
  binary, and catalog refresh failure can never invalidate an install.
- Add check_model_updates: fetches + verifies the stable catalog,
  compares installed identity per variant, caches the verified catalog
  so download_model installs the newer artifact. Implicit downgrades are
  rejected at both comparison and download.
- Model pin moves from model-v2.0.1 to model-v2.1.0 via the snapshot.

Parity:
- scripts/resolve-model.mjs resolves artifacts from the same snapshot;
  scripts/setup.sh and the CI model-preparation job consume it, deleting
  all hardcoded MODEL_URL/MODEL_SHA256 values.

Frontend:
- Settings model section shows installed versions, adds Check for
  updates / Update actions, and distinguishes runtime corrupt/failed
  states with the underlying error instead of a generic install CTA.
- The per-song Separate button is disabled with a hint while the model
  is still downloading on first run.
- New en/zh-CN copy; tests for the catalog module, identity resolution,
  update comparison, resolver parity, and the new UI states.

Refs #166.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* style(scripts): format resolve-model.mjs

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Parentc3eebe1