fix(mobile): commit font-size changes when dragging finishes

[rynfar]

Dragging a font-size slider writes preferences and reapplies global typography for every intermediate value, which can lag or trigger React's maximum update depth error. Keep the thumb and fill responsive in Reanimated while dragging, then commit the snapped value once on release. A cancelled drag returns to the saved size; taps and accessibility adjustments still commit immediately.

Adopts pingdotgg/t3code#7138 (062987b2fb0ef48cc7776d654931bd9f3bcf1f9f). Pylon's symbol component, theme integration, preferences, and fingerprint policy remain. This applies to mobile appearance settings on iOS and Android; web/desktop and provider/connection behavior are unaffected.

Validation: the mobile package's tsc --noEmit and scoped lint pass. On iOS 26.3, the same three-second slider gesture invoked the real preference-update callback five times before (17–21 pt), and once after (21 pt). The committed size was confirmed through the native accessibility snapshot. A tap changed the value immediately; accessibility decrements worked; the original 16-point preference and Pylon/system theme were restored. Temporary measurement logging was removed. Android shares this component and typecheck coverage; no Android gesture run is claimed.

Before	After

Before gesture recording · After gesture recording.

Model: GPT-6 Astra. Harness: Codex.

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.7 KiB	13.8 KiB	+172 B (+1.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	−8 B (−0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.6 KiB	6.7 KiB	+180 B (+2.7%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	56.5 KiB	57.4 KiB	+910 B (+1.6%)	66.4 KiB	✅
Codex	Live turn messages	8	10	+2 (+25.0%)	21	✅
Claude	Total thread wire	13.6 KiB	13.7 KiB	+53 B (+0.4%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	+5 B (+0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.5 KiB	6.6 KiB	+48 B (+0.7%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	57.3 KiB	57.3 KiB	+44 B (+0.1%)	66.4 KiB	✅
Claude	Live turn messages	7	8	+1 (+14.3%)	21	✅

Baseline: 983633a · PR result: d1c0734 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 111.2 KiB
• Claude decoded thread snapshot: 111.9 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.