[codex] Allow bookmarks without shortcuts

[mdroidian]

Summary

• allow saved pages to omit a keyboard shortcut
• keep shortcut badges and keyboard matching guarded for shortcutless entries
• reject invalid non-empty shortcut values instead of silently treating them as blank

Validation

• npx prettier --check src/components/QuickSwitcherSettings.tsx src/quickSwitcher.tsx tests/quickSwitcher.test.ts
• npm test
• npm run build:roam
• subagent review: initial edge case found and fixed; second review found no issues

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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.