feat(ai): add bulk model selection

[murongg]

Summary

• add a bulk action that switches between selecting and deselecting every model for the current AI provider
• derive the action from the current model state and disable it when the provider has no models
• localize the new labels for every supported language and cover both directions with the settings integration test

Validation

• pnpm --filter @markra/app test — 132 files and 1501 tests passed
• pnpm --filter @markra/shared test — 7 files and 62 tests passed
• pnpm --filter @markra/app typecheck:test
• pnpm --filter @markra/app build
• pnpm --filter @markra/shared build
• git diff --check
• Not run: manual screenshot or desktop UI QA; the settings interaction is covered by the integration test

Risk

• Low. The change only updates existing model enabled flags and does not alter persisted settings schemas.

Closes #651

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview	Aug 13, 2026 10:08am