fix(vscode): remove duplicate sidebar border

[Drixled]

Summary

Remove the webview-provided right border from the Kilo Code container so VS Code is the sole owner of the sidebar divider. This avoids the doubled vertical edge while retaining the full-height container sizing.

Visual comparison

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• packages/kilo-vscode/src/KiloProvider.ts
• .changeset/clean-vscode-sidebar-edge.md

The removed inline styles are safe: display: flex; flex-direction: column is already provided by the webview's own chat-layout.css, the duplicate height: 100% was shadowed by height: 100vh in the same rule, and dropping the webview's border-right correctly leaves VS Code as the sole owner of the sidebar divider. Full-height sizing is retained via height: 100vh, and the changeset is present with a user-facing description.

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_{Reviewed by kimi-k3 · Input: 70.7K · Output: 5.2K · Cached: 265K}

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