* feat(agents): expose thinking variant configuration in agent settings
Fix#1425: add variant field to agent config UI so users can configure
thinking/reasoning depth per agent without editing opencode.json.
Changes:
- Added variant to AgentConfig and AgentDraft types in useAgentsStore
- Pass variant in createAgent and updateAgent API calls
- Support null for temperature, top_p, and variant to clear overrides
- Added variant input field in AgentsPage 'Model & Parameters' section
- Added variant to settings search registry
- Added i18n strings for variant field in all 8 non-English locales
The variant field maps to provider-specific parameters (e.g. Anthropic
high/max variant, OpenAI reasoning effort). Users can enter any string
value; the SDK passes it through to the model provider.
Clearing temperature/topP/variant now sends null to the server instead
of omitting the field, which properly removes the override in
opencode.json.
* fix(sync): preserve tool state.time in materialization merge
* chore: trigger re-review
* fix(agents): use thinking variant selector in settings
* fix(agents): preserve thinking variant values
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Co-authored-by: Leonid Skorobogatyy <bash@opencode.itc.local>
