wip: mobile accessibility claim flow

[kiel997]

closes #488

Summary

Completed the mobile accessibility audit for the claim flow.

Completed

• Performed VoiceOver walkthrough of the claim flow
• Performed TalkBack walkthrough of the claim flow
• Documented accessibility findings
• Documented follow-up accessibility issues

Documentation

The audit results are documented in:

mobile/docs/mobile-accessibility-488.md

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[phertyameen]

@kiel997 fix ci please

[phertyameen]

Merged to \main\ as part of a consolidated integration (branch \merge-final, now pushed as commit \5155235\ on main).

Validation on main:

• Frontend CI: green
• Lighthouse CI: green
• Mobile CI: Lint & Type Check, Unit Tests, and Android/iOS prebuild all green

Note: the Mobile CI Android/iOS native debug build jobs still fail on pre-existing repo issues unrelated to this PR (react-native-reanimated vs RN 0.81 compile error, and the macos-14 runner's Xcode 15.4 vs RN's required Xcode >= 16.1). Tracked as follow-up work, not blocked by this change.