v0.3.0 — GnUserCard, NavigationShell footer slot, Vue demo partials ...

Features:
- Add GnUserCard Vue component with compact and full variants
- Add GnNavigationShell #footer slot for custom footer content
- Add profile footer demo in navigation-shell section
- Split demo/vue.html into 27 partials under demo/partials/vue/
- Fix toast open animation (nextTick + requestAnimationFrame pattern)

Style:
- Add .user-card and .user-card-compact to _cards.scss
- Add .profile-identity to _navigation-shell.scss

Docs:
- Add demo synchronization rules to CLAUDE.md

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Fix Vue demo: dark theme, label color, expanded component showcase ...

- demo/vue.html: replace broken CSS custom properties with real kit colors
  (body background #16161E, text #C0CAF5)
- demo/vue.html: update Vue CDN to 3.5.13
- demo/vue.html: expand demo to show 30+ components including
  Drawer, ConfirmDialog, Navigation, Progress, Timeline, Data Display,
  Identity, Chips, Toolbar, Overlays, EmptyState, Skeleton, Toasts
- _forms.scss: add color: $color-text-light to .label so labels are
  readable on dark backgrounds
- Add toast interaction demo buttons

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Improve Vue adapter usability, add router support, and fix animations ...

- Remove hover rotation from .btn-icon (SCSS)
- Fix iconNode to auto-prefix missing "ph-" and warn in dev
- Add CLAUDE.md as AI agent quick-reference for component usage
- Include src/vue/ and CLAUDE.md in published package files
- Add exports field wildcard for src/vue/* subpaths
- Reposition Vue adapter docs as primary contract (not thin wrapper)
- Add JSDoc @typedef to key Vue components (GnButton, GnInput, etc.)
- Add Vue demo page (demo/vue.html) linked from main navigation

Router support (optional, no hard dependency):
- Create useVueRouter composable with safe getCurrentInstance access
- Create GnRouterTabs component for route-driven tabs
- Add item.to support to GnNavList with auto-active and router.push
- Forward activeMatch through GnNavigationShell to GnNavList
- Register GnRouterTabs in plugin and index exports
- Update docs (README, CLAUDE, component-api, ai-usage-guide, component-map)

Fix missing close animations in Vue components:
- GnModal: a-hide transition before unmount (300ms)
- GnDrawer: a-hide transition before unmount (300ms)
- GnToastProvider: dismiss with a-hide animation, close for instant clear

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Prepare package release flow

Add Vue package smoke test

Document Vue adapter usage and package checks

Add remaining Vue CSS wrappers

Harden Vue adapter smoke path

Add Vue adapter foundation

Add navigation shell component

Modernize Sass build pipeline

Scaffold GNexus UI kit