feat(chat): surface model capacity queue progress on the waiting indicator

[luoxuanzao]

Summary

• Consume the CLI's model_queue_status system message (SDK SDKModelQueueStatusMessage): the transform layer maps it to a new model_queue stream chunk, and the thinking/waiting indicator shows the queue position and estimated wait — e.g. Model is queued (3 ahead · ~12s wait)... — in a warning color, restoring the usual flavor wording once the request leaves the queue.
• Why: model capacity queuing was previously invisible; users saw only the generic waiting line with no hint that the request was queued server-side.
• Compatibility: purely event-driven. Older CLIs that never emit the subtype keep current behavior (unknown system subtypes were already ignored). Zero-valued queue_count / wait_time_ms are treated as "no data" and not rendered. Nothing is persisted; the status is transient.

Verification

• npm run typecheck
• npm run lint
• npm run test (170 suites / 3602 tests, incl. 2 new transform cases for both queued and ready mappings)
• npm run build
• npm run release:check
• npm run audit:prod
• Tested affected qodercli behavior against a real CLI when applicable (live Obsidian in dev vault showed the queue indicator during a real queued request; screenshot verified)

Safety

• No credentials, private vault content, internal URLs, or personal paths are included
• User-visible changes are documented in CHANGELOG.md