Use btn-sm for Overlays dropdown/tooltip toggles ...

Co-Authored-By: Claude <noreply@anthropic.com>

Polish triggers, breadcrumbs, drawer, file preview, editable icons, logos ...

- Use btn-sm for popover, tooltip, dropdown, modal-open, confirm, toast, drawer triggers.
- Use btn-md with gap for modal and confirm-popup action buttons.
- Fix left drawer: correct SCSS nesting so .drawer-left panel slides from left.
- Align breadcrumbs demo with Figma: dark surface, active pill, collapsed rows.
- Unify File Upload preview cards with static File attachment cards markup.
- Style Editable String buttons as btn-icon-only btn-sm.
- Fix 'essentials/search' icon mapping to 'essentials/zoom/search'.
- Add Logos component block from Figma frames.
- Expand screenshot section list to cover more component demos.
- All 19 e2e tests green.

Co-Authored-By: Claude <noreply@anthropic.com>

style: polish demo visuals and add screenshot workflow ...

- Replace flat palette swatches with color cards (name + hex).
- Increase vertical spacing for demo-section and demo-row.
- Fix Description List to show term when items use { key, value }.
- Style advanced-select input like a regular input with a custom arrow.
- Resize file attachment cards from 420px to 160px, fix grid gaps and padding.
- Make demo background fixed with a subtle parallax drift on scroll.
- Link demo.css in demo/index.html so demo styles actually load.
- Add tests/demo-screenshot.spec.js and npm run screenshots for regular
  visual review.

All 19 e2e tests pass.

Co-Authored-By: Claude <noreply@anthropic.com>