chore(ci): add Docker BuildKit examples, .dockerignore, CI cache docs; tune vite config

vite.config.ts

@@ -3,6 +3,7 @@ import { sveltekit } from '@sveltejs/kit/vite';
 import tailwindcss from '@tailwindcss/vite';
 
 export default defineConfig({
+    cacheDir: 'node_modules/.vite',
     plugins: [
         tailwindcss(),
         sveltekit() // <-- Must come after Tailwind
@@ -13,7 +14,18 @@ export default defineConfig({
             ignored: ['**/documentation/**', '**/tests/**']
         }
     },
+    optimizeDeps: {
+        // Pre-bundle smaller deps; exclude large CJS libs we prefer to handle via SSR/noExternal
+        exclude: ['@codemirror/*'],
+        include: []
+    },
+    ssr: {
+        // Avoid forcing ESM conversion on large editor libs; let them be handled as-is
+        noExternal: ['@codemirror/*']
+    },
     build: {
+        sourcemap: false,
+        minify: 'esbuild',
         rollupOptions: {
             output: {
                 // Keep all svelte internals in one chunk to prevent circular