feat: migrate frontend React 18 → Svelte 5 + SvelteKit

Core logic portable (economy, balance, cosmetics, migrateSave) — zero rewrite.
136 tests green, identiques. Backend inchangé.

- Svelte 5 runes stores (game, auth, toast) remplacent Zustand
- SvelteKit adapter-static SPA (dist/ output, fallback index.html)
- Tailwind v4 conservé, design system .gp-* porté
- Transitions natives : slide, fly, scale, fade sur toute l'UI
- Sidebar tabbée (Production/Evolution/Collection) + CollapsiblePanel
- Mobile bottom sheet avec FAB toggle + backdrop blur
- Click particles réactifs Svelte (plus de DOM impératif)
- TadpoleSprite bounce + glow ring au clic
- Guide refait en accordéon, Achievements avec filtres
- a11y : focus-visible, Escape modals, aria-current, aria-labels
- CI/CD adapté (tests + build + rsync)
- Build 504K (vs ~1.2MB React)

Frontend/package.json

@@ -1,35 +1,27 @@
 {
-  "name": "template",
-  "private": true,
-  "version": "0.0.0",
-  "type": "module",
-  "scripts": {
-    "dev": "vite",
-    "build": "vite build",
-    "lint": "eslint . --ext js,jsx --report-unused-disable-directives --max-warnings 0",
-    "preview": "vite preview",
-    "test": "vitest run"
-  },
-  "dependencies": {
-    "@tailwindcss/vite": "^4.2.2",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0",
-    "react-helmet": "^6.1.0",
-    "react-lottie-player": "^1.5.5",
-    "react-router-dom": "^6.19.0",
-    "tailwindcss": "^4.2.2",
-    "zustand": "^5.0.12"
-  },
-  "devDependencies": {
-    "@types/react": "^18.3.28",
-    "@types/react-dom": "^18.2.15",
-    "@vitejs/plugin-react": "^4.2.0",
-    "eslint": "^8.53.0",
-    "eslint-plugin-react": "^7.33.2",
-    "eslint-plugin-react-hooks": "^4.6.0",
-    "eslint-plugin-react-refresh": "^0.4.4",
-    "typescript": "^5.9.3",
-    "vite": "^5.0.0",
-    "vitest": "^4.1.0"
-  }
+	"name": "clickerz-frontend",
+	"private": true,
+	"version": "0.0.1",
+	"type": "module",
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"prepare": "svelte-kit sync || echo ''",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+		"test": "vitest run"
+	},
+	"devDependencies": {
+		"@sveltejs/adapter-static": "^3.0.10",
+		"@sveltejs/kit": "^2.50.2",
+		"@sveltejs/vite-plugin-svelte": "^6.2.4",
+		"@tailwindcss/vite": "^4.2.2",
+		"svelte": "^5.54.0",
+		"svelte-check": "^4.4.2",
+		"tailwindcss": "^4.2.2",
+		"typescript": "^5.9.3",
+		"vite": "^7.3.1",
+		"vitest": "^4.1.0"
+	}
 }