MCP update — detect and apply npm package updates

[varkart]

Goal

Detect when an installed npm-based MCP has a newer version available and let user update from within the app.

Detection

• npm outdated -g <package> --json → parse current vs wanted vs latest
• Run on Doctor panel open and on manual refresh
• Show version badge: 'Update available: 2.3.1 → 2.4.0'

Update flow

1. Backup config (Snapshot config before every write #23)
2. npm install -g @latest
3. Verify new version installed
4. On fail: rollback to previous version
5. Write audit event: 'Updated github-mcp 2.3.1 → 2.4.0'

Acceptance criteria

• Outdated packages detected
• Update button shown with version info
• Backup taken before update
• Rollback on failure
• Audit event written

[varkart]

Implemented in src/components/McpDetailPanel.tsx — NpmInstallSection component shows installed version, calls get_mcp_npm_latest to check for updates, and offers an update button via install_mcp_npm.