fix(tui): preserve provider category groups in model picker

[md-abusayeed]

Fixes #13123

Summary

When models were present in favorites or recents, the model picker filtered them out of the provider list. For custom providers with small catalogs (e.g. 1 or 2 models defined in global kilo.json), selecting those models placed all of them in recents, causing the entire custom provider category group to disappear from the model selector.

Changes

• Added explicit regression unit test in packages/tui/test/kilocode/model-picker.test.ts verifying that custom provider category headers remain intact when all their models are in recent selections (Custom Provider in Global kilo.json Not Appearing as Group in Model Picker #13123).
• Added changeset .changeset/model-picker-provider-grouping.md.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/model-picker-provider-grouping.md
• packages/tui/src/component/dialog-model.tsx
• packages/tui/test/cli/cmd/tui/model-options.test.ts

Previous Review Summary (commit b0832fd)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit b0832fd)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/model-picker-provider-grouping.md
• packages/tui/src/component/dialog-model.tsx
• packages/tui/test/cli/cmd/tui/model-options.test.ts

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_{Review guidance: REVIEW.md from base branch main}

[johnnyeric]

Thanks for working on this, @md-abusayeed. The overlapping model-picker fix landed in #13170 and shipped in v7.4.23, so I’m closing this PR as superseded since the current diff adds no runtime fix.