UI-правки по результатам визуального ревью

Add GnActionCard, GnActionList, GnCopyButton, GnRange and GnTagInput ...

- Mirror reference component APIs and register them in the Vue plugin and index.

- Add supporting styles for action-card, list-actions, range, tag-input and .btn-icon.

- Add Vue demo mounts to cards, lists and inputs partials.

- Capture Lists section in screenshot review.

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

Add GnAvatarStack, GnChipGroup, GnCombobox and GnSearchField Vue components ...

- Mirror reference gnexus-ui-kit API for avatar stack, chip group, combobox and search field.

- Add supporting styles for .avatar-stack, .avatar-xs and .chip-group.

- Add Vue demo mounts to avatar, chips, advanced-select and inputs partials.

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

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 Input, Badge, Alert components and foundation demos ...

- Add src/scss/components/_forms.scss with input, label, help text,
  and error/success/warning states.
- Add src/scss/components/_badges.scss and _alerts.scss with semantic
  variants and outline/size options.
- Add GnInput, GnBadge, GnAlert Vue adapters mirroring gnexus-ui-kit API.
- Update plugin and entry exports for new components.
- Add demo partials for Typography, Palette, Utilities, Inputs, Badges,
  and Alerts, and include them in demo/index.html.
- Extend Vue example app to render new components.