Add asset pipeline and professionalize theme

Introduce a Node build system for minified CSS/JS with content hashes,
add PWA support, i18n helpers, accessibility improvements, and more
translatable strings. Move theme configuration from bookmarks to
localStorage, add Playwright tests, and set up CI workflows.

shaarli-pro/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "shaarli-pro-theme",
+  "version": "1.1.0",
+  "description": "Professional theme for Shaarli with advanced UI features",
+  "private": true,
+  "scripts": {
+    "build": "node build.js",
+    "build:css": "node build.js --css-only",
+    "build:js": "node build.js --js-only",
+    "clean": "node -e \"require('fs').rmSync('dist',{recursive:true,force:true})\"",
+    "test:e2e": "playwright test",
+    "test:e2e:install": "playwright install --with-deps"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.62.1",
+    "cssnano": "^7.0.6",
+    "postcss": "^8.4.41",
+    "terser": "^5.31.6"
+  },
+  "engines": {
+    "node": ">=18"
+  }
+}