fix(vscode): remove selected project indicator

[marius-kilocode]

Agent Manager added a blue vertical marker and extra left inset to the active project row. The marker is redundant with the selected project content and makes the project list feel unnecessarily indented.

This removes the decorative marker and restores the row to the standard horizontal padding while preserving project activation, restoration, and expansion behavior.

Before:

After:

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/remove-project-selection-indicator.md
• packages/kilo-vscode/webview-ui/agent-manager/ProjectsSection.tsx
• packages/kilo-vscode/webview-ui/agent-manager/agent-manager.css

lgtm — the removed am-project-active class has no remaining references anywhere in the repo, project().active is still used for click behavior so the data model is untouched, the padding change is consistent with the marker removal, and a user-facing patch changeset is included.

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_{Reviewed by kimi-k3 · Input: 69K · Output: 5.1K · Cached: 335.4K}

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