[DoodleBears]

Requested by Vain · project thread

Why the change

QA on the iOS 27 Simulator found a problem with the glass buttons from #2487 at AX5. The SF Symbols in the Chats and Activity header buttons grow with Dynamic Type, but the 44pt glass circle stays the same size, so the glyphs spill out of it.

Issue / Discussion: follow-up to #2487.

Special things to note

• Merge risk: very low. This adds one SwiftUI modifier, dynamicTypeSize({ max: 'xxxLarge' }), on the symbol in HeaderAction on iOS 26+. System toolbar symbols behave the same way: they stop growing at accessibility sizes, and the accessibility label is still there. Nothing changes for iOS < 26 or Android.
• Verification: vitest test/header-action.test.tsx, tsc --noEmit and pnpm lint all pass. Not yet run: an AX5 re-check on the iOS 27 Simulator. Following Vain's merge-first rule, it will run in the next combined batch on main.
• No changes/ fragment: this fixes the unreleased feat(mobile): native Chats and Activity header buttons (Liquid Glass on iOS 26, Material 3 on Android) #2487 entry, which still describes the behaviour correctly.
• CI test plan: affected (mobile only).

Change outline

• header-action.ios.tsx: adds dynamicTypeSize({ max: 'xxxLarge' }) to the Image.
• DESIGN.md: one sentence on the cap.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4227b25 and d6d3db0.

📒 Files selected for processing: 3

• apps/mobile/DESIGN.md
• apps/mobile/src/ui/shell/header-action.ios.tsx
• apps/mobile/test/header-action.test.tsx

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