fix(vscode): use models sparkle icon for auto model

[johnnyeric]

Context

Auto model entries were using the branch icon, which reads like source-control branching instead of automatic model selection.

Implementation

Use the existing models sparkle icon for Auto model display in the shared model preview and selector surfaces.

Screenshots / Video

How to Test

Manual/local verification

• Agent: bun turbo typecheck during pre-push; passed.
• Executed extension to validate the change

Reviewer test steps

1. Open the VS Code extension model selector.
2. Select or view an Auto model entry.
3. Confirm the Auto model uses the models sparkle icon instead of the branch icon.

Checklist

• Issue linked above, or exception explained
• Tests/verification described
• Screenshots/video included for visual changes, or marked N/A
• Changeset considered for user-facing changes
• I personally reviewed the diff and can explain the changes, including any AI-assisted work.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/model-selector-auto-icon.md
• packages/kilo-vscode/webview-ui/src/components/shared/ModelPreview.tsx
• packages/kilo-vscode/webview-ui/src/components/shared/ModelSelector.tsx

Previous Review Summary (commit 37b9bea)

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

Previous review (commit 37b9bea)

Status: 1 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	0

Fix these issues in Kilo Cloud

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/kilo-vscode/webview-ui/src/components/shared/ModelSelector.tsx	968	Missing changeset for a user-visible VS Code fix

Files Reviewed (2 files)

• packages/kilo-vscode/webview-ui/src/components/shared/ModelPreview.tsx - 0 issues
• packages/kilo-vscode/webview-ui/src/components/shared/ModelSelector.tsx - 1 issue

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_{Reviewed by gpt-5.4-20260305 · Input: 43.6K · Output: 4.7K · Cached: 248.3K}

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