lighter first load, math reads left-to-right in quizzes, tickets from the server, readable separators

- Every screen but home is its own chunk and preloads when the browser is
  idle; React and motion get their own long-cached chunks. The app entry
  goes from 505 kB (160 kB gzip) to 85 kB (27 kB gzip).
- Quiz prompts, options and lesson examples go through MathText, so
  '10 + 3 - 7 - 2' reads from the left; an unpaired bracket at the edge of
  a math run stays with the Persian sentence.
- Support lists tickets from GET /support/tickets instead of this
  browser's localStorage; a ticket's messages load when it is opened.
- '·' next to a Persian zero read as another digit ('فصلِ ۱ · ۰' looked
  like ۱۰۰); a thin bar separates them now. Notification bodies show
  Persian digits.
- A root or vertex the model already marked with coordinates is no longer
  labelled a second time on top of it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

vite.config.ts

@@ -12,6 +12,18 @@ export default defineConfig(({ mode }) => {
     resolve: {
       alias: { '@': path.resolve(__dirname, './src') },
     },
+    build: {
+      rollupOptions: {
+        output: {
+          // کتابخانه‌ها با هر انتشار عوض نمی‌شوند؛ فایلِ جدا یعنی بعد از هر دیپلوی
+          // از کشِ مرورگر می‌آیند و فقط کدِ خودِ اپ دوباره دانلود می‌شود.
+          manualChunks: {
+            react: ['react', 'react-dom'],
+            motion: ['motion/react'],
+          },
+        },
+      },
+    },
     server: {
       // در توسعه /api هم‌دامنه است و به بک‌اند پاس داده می‌شود؛ CORS لازم نیست.
       proxy: {