math in Persian text: lists read right-to-left, every content text goes through MathText, chat input picks its direction per line

Measured by rendering every question, option and several tutor answers in
Chrome and comparing the on-screen x of each number (2026-09-29):
- A list inside a sentence ('از −۳ به −۲، −۱، ۰ می‌رسیم', 'الگویِ ۲، ۵، ۸')
  was locked as one left-to-right run, so all 482 read backwards. '،' and
  '؛' outside brackets now split the run; sets and coordinates in brackets
  stay one run. Locked runs are isolates (isolate-override), otherwise the
  comma between two of them was still pulled left-to-right.
- Without MathText 704 of 931 minus signs and 602 of 983 expressions were
  misplaced; lesson and island titles, the lesson intro, unit blurb,
  notification bodies and ticket messages now go through it.
- The chat box takes its direction from each line's first letter, so a
  line of pure math stays left-to-right while typing. A line that starts
  in Persian can still show its math reordered inside the box; a textarea
  cannot isolate part of its text. The sent message renders correctly.

Four expressions with Persian words inside them ('f(x) = (ریشه دوم x) + ۵۰')
remain ambiguous.

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

src/screens/SupportScreen.tsx

@@ -6,6 +6,7 @@ import { useToast } from '@/components/Toast';
 import { InlineError, PrimaryButton, Screen, ScreenBody, ScreenHeader, Sep } from '@/components/ui';
 import { friendlyError } from '@/lib/errors';
 import { toFa } from '@/lib/format';
+import { MathText } from '@/lib/MathText';
 
 const CATEGORIES = [
   { id: 'learning', label: 'درس و سوال‌ها' },
@@ -165,7 +166,7 @@ function TicketCard({ summary }: { summary: TicketSummary }) {
               key={m.id}
               className={`whitespace-pre-line rounded-2xl px-3.5 py-2.5 text-xs leading-6 ${m.sender === 'user' ? 'mr-8 bg-soft text-body' : 'ml-8 bg-[#EEF1FF] text-ink'}`}
             >
-              {m.text}
+              <MathText text={m.text} />
             </div>
           ))}
           {t && status !== 'closed' && (