Files
linshen a53d0f36d6 feat(arena): add unified multi-model comparison workspace
- Reuse shared input, model selectors and output components for independent
  text and image test columns with responsive side-by-side comparison.
- Add parallel request-local model selection, desktop streaming support,
  session transfer and image asset persistence without changing shared configs.
- Remove redundant model scope and stale-result copy across workspaces.
- Document final behavior and add focused runtime, session, UI and IPC coverage.

Validation: 32 core contract/transfer tests, 12 Arena session tests and 20 desktop
IPC tests passed. Related UI regressions, type/locale checks and builds were
verified during implementation.
2026-11-02 23:42:12 +08:00
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