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 InputPatterns and editableString browser helpers ...

- Implement InputPatterns helper for input clear, date picker trigger and file upload previews
- Implement editableString helper for inline text/textarea editing
- Add component styles and data-patterns demo partial
- Wire exports in browser bundle and auto-init InputPatterns on DOMContentLoaded
- No console errors, all 17 e2e tests pass

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