fix(agent-manager): remove toolbar help icon

[marius-kilocode]

What Problem This Solves

The Agent Manager toolbar includes a help icon that adds clutter beside the worktree actions.

Why This Change Was Made

Remove the introduction shortcut from both the single-project and multi-project toolbars. Keep first-use onboarding and the welcome-screen introduction link unchanged.

User Impact

The toolbar no longer shows the "How Agent Manager works" icon. Search, worktree creation, keyboard shortcuts, history, and settings remain available.

Evidence

• Extension build, host/webview type checks, lint, Knip, and annotation guard passed. Agent Manager architecture tests: 75 passed.
• Isolated VS Code self-test confirmed that both toolbars omit the help icon. Keyboard shortcuts still open, and dismissing then reopening the introduction from the welcome screen works.
• Console inspection showed only an extension-host Node deprecation warning, with no webview errors.

Single-project toolbar:

Multi-project toolbar:

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (6 files)

• .changeset/remove-agent-manager-help-icon.md
• packages/kilo-vscode/webview-ui/agent-manager/AgentManagerApp.tsx
• packages/kilo-vscode/webview-ui/agent-manager/ProjectList.tsx
• packages/kilo-vscode/webview-ui/agent-manager/SidebarBody.tsx
• packages/kilo-vscode/webview-ui/agent-manager/WorktreeSectionActions.tsx
• packages/kilo-vscode/webview-ui/src/stories/agent-manager.stories.tsx

---

_{Reviewed by grok-4.6 · Input: 89K · Output: 4.8K · Cached: 238.7K}

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