Refactor: déplacer router et animations hors de state/

- src/state/router.js → src/router/index.js
- src/state/animations.js → src/utils/animations.js
- Ajout des alias @router et @utils dans vite.config.js
- Mise à jour des imports dans Header.svelte et main.js

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/router/index.js

@@ -0,0 +1,93 @@
+import navaid from "navaid";
+import { page } from "@state/page.svelte";
+import { navigation } from "@state/navigation.svelte";
+import { site } from "@state/site.svelte";
+import { locale } from "@state/locale.svelte";
+
+export const router = navaid("/", () => {
+  // Default handler
+});
+
+async function loadPage(path) {
+  navigation.setLoading(true);
+  page.setLoading(true);
+
+  try {
+    const response = await fetch(`${path}.json`);
+
+    if (!response.ok) {
+      throw new Error(`Failed to load page: ${response.status}`);
+    }
+
+    const data = await response.json();
+
+    if (data.site) {
+      site.set(data.site);
+      locale.initialize(data.site.language, data.site.languages);
+    }
+
+    page.set({
+      data,
+      template: data.template || "default",
+      url: path,
+      loading: false,
+      error: null,
+    });
+
+    window.scrollTo(0, 0);
+  } catch (error) {
+    console.error("Failed to load page:", error);
+    page.setError(error);
+  } finally {
+    navigation.setLoading(false);
+  }
+}
+
+// Route handlers
+router
+  .on("/", () => loadPage("/home"))
+  .on("/expertise", () => loadPage("/expertise"))
+  .on("/portfolio", () => loadPage("/portfolio"))
+  .on("/portfolio/:slug", ({ slug }) => loadPage(`/portfolio/${slug}`))
+  .on("/jouer", () => loadPage("/jouer"))
+  .on("/jouer/:slug", ({ slug }) => loadPage(`/jouer/${slug}`))
+  .on("/a-propos", () => loadPage("/a-propos"))
+  .on("/blog", () => loadPage("/blog"))
+  .on("/blog/:slug", ({ slug }) => loadPage(`/blog/${slug}`))
+  .on("*", (params) => {
+    // Fallback for other routes
+    loadPage(window.location.pathname);
+  });
+
+export function initRouter() {
+  // Start listening to route changes
+  router.listen();
+
+  // Intercept internal link clicks
+  document.addEventListener("click", (e) => {
+    const link = e.target.closest("a");
+    if (!link) return;
+
+    const url = new URL(link.href, window.location.origin);
+
+    // Only intercept same-origin links without target attribute
+    if (
+      url.origin === window.location.origin &&
+      !link.target &&
+      !link.hasAttribute("download")
+    ) {
+      e.preventDefault();
+      navigateTo(url.pathname);
+    }
+  });
+
+  // Handle browser back/forward
+  window.addEventListener("popstate", () => {
+    router.run(window.location.pathname);
+  });
+}
+
+export function navigateTo(path) {
+  window.history.pushState({}, "", path);
+  loadPage(path);
+}