fix(ui): align editor subblocks and combobox styling

[waleedlatif1]

Summary

• Align fallback-model rows with the editor's compact headers, field spacing, and icon actions.
• Keep folder, knowledge-base, MCP, and fallback pickers on the existing editor combobox styling so they can migrate together.
• Preserve editable combobox styling when file controls add clear-button padding.

Type of Change

• Bug fix

Testing

• 235 affected tests passed across editor, MCP, fallback-model, and shared combobox suites.
• App and EMCN type-checks, repository lint, all 47 audits (including API validation), and generated-artifact checks passed.
• Verified light/dark component previews at narrow editor widths and fallback tuning selection.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 20, 2026 12:53am UTC

[greptile-apps]

Confidence Score: 4/5

The functional changes appear sound, but the explicit requirement to use chip-family selectors must be satisfied before merging.

Findings

1.  Legacy selector components ▶

Summary

This PR restyles fallback-model rows and related editor selectors, replaces chip-family selectors with the shared base combobox, and fixes editable combobox class-name merging.

• Introduces compact fallback-row headers, icon actions, spacing, and add-control styling.
• Migrates model, secret, tuning, knowledge-base, MCP, and folder selectors to Combobox.
• Preserves caller-provided editable-input classes and adds focused DOM coverage.
• Updates selector and fallback-list tests for the component changes.

_{Reviews (2) · Last reviewed commit: "fix(ui): keep editor pickers on shared c..."}

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

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[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

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[cubic-dev-ai]

No issues found across 10 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

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