Add Vue demo mounts for buttons, inputs, tables and capture inputs section ...

- Add GnButton, GnInput and GnTable Vue demo mounts.

- Switch tables partial to demo-section for screenshot capture.

- Add dismissible alert styles and close button.

- Include Inputs section in screenshot review list.

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

Add Table, List, Skeleton, Tooltip, Dropdown, NavigationShell ...

- Implement Table styles + browser helper + GnTable/GnTableRow/GnTableHeader
  with sortable/selectable variants.
- Implement List styles + browser helper + GnList/GnListItem.
- Implement Skeleton placeholders + browser helper + GnSkeleton.
- Implement Tooltip styles + browser helper + GnTooltip.
- Implement Dropdown menu styles + browser helper + GnDropdown/GnDropdownItem.
- Implement NavigationShell layout + browser helper + GnNavigationShell/GnNavigationItem.
- Wire all new components into kit.scss, Vue plugin, Vue entry, and browser bundle.
- Add demo partials for every new component.
- Update docs/component-coverage.md and PROJECT_NOTES.md.
- Builds and tests pass.