[Bug]: Mobile has no Render math setting; $…$ / $$…$$ LaTeX shows as raw source #32063

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/mobile

Steps to reproduce

1. On desktop, enable Settings → Appearance → Render math.
2. Get an assistant reply containing dollar-delimited math, e.g.
   $$20\ \text{kg bar} + 8 \times 20\ \text{kg} = 180\ \text{kg}$$
   and inline $45 + 8 \times 45 = 405$.
3. Open the same thread in the phone app.
4. Look for a Render math toggle in the phone app's Settings → Appearance.

Expected behavior

Math renders as typeset equations on the phone, or the phone app offers a Render math toggle like desktop.

Actual behavior

The phone app shows the raw LaTeX source with $ / $$ delimiters. There is no Render math setting in the phone app at all, so it can't be enabled there. The same reply renders correctly on desktop.

Related: #29599 (same symptom on iPad with […]); open fixes #29708 / #29739 only mention (…) / […] delimiters, so $ / $$ may not be covered.

Impact

Major degradation or frequent failure

Version or commit

Host 0.1.8-nightly.20261106.4262; mobile build not recorded

Environment

T3 Code mobile app on phone (device model/OS not recorded). Host: T3 Code Nightly 0.1.8-nightly.20261106.4262 on macOS 26.6.2.

Workaround

Read math-heavy replies on desktop.