The cron backend has always supported per-job model/provider pins (the
dashboard web UI and the cronjob tool expose them), but the desktop app's
cron editor had no way to set one — every job silently ran on the global
default model.
- Cron editor gains an optional Model select, grouped by provider, fed by
the same model.options catalog as the chat model picker (configured
providers with available models only, curated order preserved).
- Resetting to 'Default (global model)' clears a previous pin (model and
provider written as null); script-only (no_agent) jobs never touch the
model fields since the scheduler ignores overrides for them.
- A pinned model that has since left the catalog stays visible and
re-selectable instead of rendering Radix's blank trigger.
- Job detail pane shows the pinned model when one is set.
- ui/select grows SelectGroup + SelectLabel primitives for the grouped list.
- CronJob/CronJobCreatePayload/CronJobUpdates types carry model/provider;
en/ja/zh/zh-hant locales add the two new labels.
The cronjob model tool schema is intentionally unchanged — model selection
stays a user-facing UX affordance, not an agent-facing tool parameter.
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