[codex] Reduce quick switcher startup work

[mdroidian]

Summary

• avoid persisting sanitized bookmark settings during extension initialization
• skip rendering the closed Quick Switcher dialog until it is first opened
• keep settings updates and keyboard shortcuts using the latest in-memory bookmarks

Validation

• npx prettier --check src/quickSwitcher.tsx
• npm test
• npm run build:roam
• subagent review: no issues found; noted remaining controller lifecycle test gap

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[charliecreates]

Reviewed the latest changes, and I don't have actionable feedback to address.