Polish visual defects: color cards, spacing, date picker, file attachments, progress, input group, timeline, icon mappings ...

- demo: remove page background layer, add vertical spacing for demo rows
- palette: wrap color swatches in color cards with name/hex labels
- description list: style description-list-term distinctly
- file-upload: shrink attachment cards to 130px, increase gaps, center placeholder text
- forms: add .input-date styling with calendar icon and focus ring
- input-group: seamless action slot button without double borders
- progress: add vertical spacing between consecutive progress bars
- timeline: align marker connector line at left: 23px
- vue: make GnIconButton label optional, add Phosphor icon mappings
- tests: screenshot workflow passing, all 19 e2e tests green

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

Add Tabs, Avatar, Chip, and Progress components ...

- Implement pill/compact/vertical tabs with browser helper and Vue adapters
  (GnTabs, GnTab, GnTabPanel) plus keyboard navigation.
- Add Avatar styles and GnAvatar with initials/image/icon and status dot.
- Add Chip styles and GnChip removable/selectable chip.
- Add Progress styles, browser helper, and GnProgress linear/step.
- Wire new components into kit.scss, Vue plugin, Vue entry, and browser bundle.
- Add demo partials and update docs/component-coverage.md + PROJECT_NOTES.md.
- All builds and smoke tests pass.