Add biome + rolldown + lightningcss build pipeline for JS/CSS bundling & minification

- package.json with biome, rolldown, lightningcss devDependencies  
- biome.json: add CSS formatter support
- scripts/build-css.mjs: lightningcss resolves @import chain, bundles/minifies CSS  
- scripts/build-js.mjs: rolldown per-entry JS bundling (no code splitting)
- scripts/build.mjs: orchestrator for both CSS + JS
- scripts/check-build.mjs: staleness checker for CI/deploy guard
- justfile: add build, build-css, build-js, build-install, build-check recipes
- justfile: deploy recipe now runs build before deploy-code
- head.php + form-page.php: use dist/base.min.css instead of style.css
- All controllers + FormBootstrap: reference dist/*.min.{css,js}
- admin footer: load admin.min.js for all admin pages
- repertoire: use public.min.js instead of individual app JS files
- Fix stray '}' syntax error in admin.css line 305
- .gitignore: add app/public/assets/dist/

rolldown.config.mjs

@@ -0,0 +1,43 @@
+/**
+ * Rolldown configuration for XAMXAM JS bundling.
+ *
+ * Entry points:
+ *   - admin.js  → all JS needed on admin pages
+ *   - public.js → all JS needed on public-facing pages
+ *   - form.js   → all JS needed on admin form pages (add/edit)
+ *
+ * Vendor scripts (htmx, FilePond plugins, OverType) are NOT bundled —
+ * they're already minified and served from vendor/.
+ *
+ * Output: app/public/assets/dist/[name].min.js
+ */
+
+import { defineConfig } from "rolldown";
+import { resolve, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const root = __dirname;
+const jsDir = resolve(root, "app/public/assets/js/app");
+const distDir = resolve(root, "app/public/assets/dist");
+
+export default defineConfig({
+  input: {
+    admin: resolve(jsDir, "admin-entry.js"),
+    public: resolve(jsDir, "public-entry.js"),
+    form: resolve(jsDir, "form-entry.js"),
+    partage: resolve(jsDir, "partage-entry.js"),
+  },
+  output: {
+    dir: distDir,
+    format: "esm",
+    entryFileNames: "[name].min.js",
+    // Disable code splitting — each entry gets its own self-contained bundle.
+    codeSplitting: false,
+    // rolldown built-in minification
+    minify: true,
+  },
+  resolve: {
+    extensions: [".js"],
+  },
+});