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/

biome.json

@@ -10,6 +10,14 @@
       "!app/public/assets/js/vendor/**"
     ]
   },
+  "css": {
+    "formatter": {
+      "enabled": true
+    },
+    "linter": {
+      "enabled": false
+    }
+  },
   "linter": {
     "enabled": true,
     "rules": {
@@ -17,6 +25,7 @@
     }
   },
   "formatter": {
-    "enabled": true
+    "enabled": true,
+    "includes": ["**/*.js", "**/*.css"]
   }
 }