chore: initial DSMMG v0.2 — refonte architecturale complète

Mise en place du Design System ManageMate Group v0.2 — refonte du
système de tokens (préfixe --mmg-color-*), 9 presets accent
user-themable validés WCAG AA, overlays Radix UI + Floating UI,
Storybook 8 + Vitest + axe-core en CI, doc Astro Starlight,
DESIGN.md (format google-labs-code) et exports tokens DTCG/CSS/
TS/Figma/Tailwind v3 et v4.

- 4 packages monorepo pnpm : @managemate/{tokens,css,react,icons}
- 62 composants React headless-first (Sheet, HoverCard, ContextMenu,
  Slider, ToggleGroup, AvatarGroup, UserCard, ProfileHeader,
  MetricCard, PricingCard, FeatureCard, Text/Display/Eyebrow/Lead…)
- Lint contraste WCAG : 37/37 paires AA, branché CI
- Toast pile Sonner-style avec ResizeObserver
- Theming user (9 presets) sans casser sémantique fixe
- Identité Synapse (rose #D12B6A) préservée

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/css/src/components/feature-card.css

@@ -0,0 +1,123 @@
+/* ════════════════════════════════════════════════════════════════
+   FeatureCard — icône + titre + description + lien.
+   Variant `glow` ajoute un border-gradient animé au hover (Vercel-style).
+════════════════════════════════════════════════════════════════ */
+
+.mmg-feature-card {
+  position: relative;
+  display: flex;
+  flex-direction: column;
+  gap: var(--mmg-space-3);
+  padding: var(--mmg-space-6);
+  background: var(--mmg-color-bg-surface);
+  border: 1px solid var(--mmg-color-border);
+  border-radius: var(--mmg-radius-card);
+  isolation: isolate;
+  transition:
+    transform var(--mmg-duration-base) var(--mmg-ease-emphasis),
+    border-color var(--mmg-duration-base) var(--mmg-ease-default);
+}
+.mmg-feature-card:hover {
+  transform: translateY(-2px);
+  border-color: var(--mmg-color-border-strong);
+}
+
+/* — Icon coloré ——————————————————————————————— */
+.mmg-feature-card__icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 48px;
+  height: 48px;
+  border-radius: 14px;
+  margin-bottom: var(--mmg-space-2);
+}
+.mmg-feature-card__icon--brand   { background: var(--mmg-color-accent-soft);  color: var(--mmg-color-accent); }
+.mmg-feature-card__icon--blue    { background: var(--mmg-color-blue-100);     color: var(--mmg-color-blue-600); }
+.mmg-feature-card__icon--green   { background: var(--mmg-color-green-100);    color: var(--mmg-color-green-600); }
+.mmg-feature-card__icon--amber   { background: var(--mmg-color-amber-100);    color: var(--mmg-color-amber-600); }
+.mmg-feature-card__icon--violet  { background: var(--mmg-color-violet-100);   color: var(--mmg-color-violet-600); }
+.mmg-feature-card__icon--neutral { background: var(--mmg-color-bg-muted);     color: var(--mmg-color-text-secondary); }
+
+[data-mmg-theme="dark"] .mmg-feature-card__icon--blue   { background: rgba(96, 165, 250, 0.16);  color: var(--mmg-color-blue-d-300); }
+[data-mmg-theme="dark"] .mmg-feature-card__icon--green  { background: rgba(52, 211, 153, 0.16);  color: var(--mmg-color-green-d-300); }
+[data-mmg-theme="dark"] .mmg-feature-card__icon--amber  { background: rgba(251, 191, 36, 0.16);  color: var(--mmg-color-amber-d-300); }
+[data-mmg-theme="dark"] .mmg-feature-card__icon--violet { background: rgba(167, 139, 250, 0.16); color: var(--mmg-color-violet-d-300); }
+
+.mmg-feature-card__title {
+  margin: 0;
+  font-size: var(--mmg-font-size-lg);
+  font-weight: var(--mmg-font-weight-bold);
+  letter-spacing: -0.01em;
+  color: var(--mmg-color-text-primary);
+}
+.mmg-feature-card__desc {
+  margin: 0;
+  font-size: var(--mmg-font-size-sm);
+  line-height: 1.55;
+  color: var(--mmg-color-text-tertiary);
+}
+.mmg-feature-card__link {
+  margin-top: auto;
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  font-size: var(--mmg-font-size-sm);
+  font-weight: var(--mmg-font-weight-semi);
+  color: var(--mmg-color-accent);
+  text-decoration: none;
+  transition: gap var(--mmg-duration-fast) var(--mmg-ease-emphasis);
+}
+.mmg-feature-card__link:hover {
+  gap: 8px;
+  text-decoration: none;
+}
+
+/* — Variant glow : hover propre (border accent + ombre teintée + lift) ——
+   L'ancienne version utilisait un conic-gradient masqué qui produisait
+   un effet fragmenté/coupé selon les browsers (mask-composite: exclude
+   pas toujours fiable, animation de rotation visible derrière le bord
+   arrondi). Cette version : bordure accent franche, ombre teintée à 3
+   niveaux, halo radial subtil interne, micro-lift de l'icône. Sobre,
+   universel, pas de transform: rotate qui peut "déborder". */
+.mmg-feature-card--glow {
+  transition:
+    transform var(--mmg-duration-base) var(--mmg-ease-emphasis),
+    border-color var(--mmg-duration-base) var(--mmg-ease-default),
+    box-shadow var(--mmg-duration-base) var(--mmg-ease-default);
+}
+.mmg-feature-card--glow:hover {
+  transform: translateY(-3px);
+  border-color: var(--mmg-color-accent);
+  box-shadow:
+    0 0 0 1px var(--mmg-color-accent),
+    0 12px 40px -10px color-mix(in srgb, var(--mmg-color-accent) 38%, transparent),
+    0 4px 12px -4px color-mix(in srgb, var(--mmg-color-accent) 22%, transparent);
+}
+.mmg-feature-card--glow .mmg-feature-card__icon {
+  transition: transform var(--mmg-duration-base) var(--mmg-ease-emphasis);
+}
+.mmg-feature-card--glow:hover .mmg-feature-card__icon {
+  transform: scale(1.06);
+}
+/* Halo radial interne très subtil — donne de la profondeur sans alourdir */
+.mmg-feature-card--glow::after {
+  content: "";
+  position: absolute;
+  inset: 0;
+  border-radius: inherit;
+  background: radial-gradient(circle at 50% 0%,
+    color-mix(in srgb, var(--mmg-color-accent) 8%, transparent) 0%,
+    transparent 60%);
+  opacity: 0;
+  transition: opacity var(--mmg-duration-base) var(--mmg-ease-default);
+  pointer-events: none;
+  z-index: 0;
+}
+.mmg-feature-card--glow:hover::after { opacity: 1; }
+.mmg-feature-card--glow > * { position: relative; z-index: 1; }
+
+@media (prefers-reduced-motion: reduce) {
+  .mmg-feature-card--glow:hover { transform: none; }
+  .mmg-feature-card--glow:hover .mmg-feature-card__icon { transform: none; }
+}