Add haptic feedback to SOS confirmation flow in `SOSButton.tsx`

[success-OG]

Labels: frontend accessibility UX

Background
src/components/SOSButton.tsx (5 KB) shows a visual countdown but provides no haptic feedback. Users in a stressful emergency may not be looking at the screen and need tactile confirmation that the SOS is counting down and then sent.

What "Done" Looks Like

• During countdown: haptic tick once per second (light impact)
• On SOS sent: strong haptic impact + a second impact 200 ms later (double tap feeling)
• On SOS cancelled: medium impact
• Use expo-haptics (already a dependency via Expo)
• Haptic intensity configurable in accessibility settings (can be disabled)

[jerryjuche]

@jerryjuche has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I'm interested in improving the app's accessibility and emergency UX. I have experience building React Native and Expo applications, integrating expo-haptics, implementing accessible user interactions, and ensuring configurable settings with reliable, user-friendly behavior.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @jerryjuche to this issue.

[aliyuHabibu]

@aliyuHabibu has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, please assign this issue to me. Thank you

ℹ️ Repo Maintainers: To accept this application, review their application or assign @aliyuHabibu to this issue.

[pugsley76]

@pugsley76 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hey mate can I work on this issue please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @pugsley76 to this issue.

[drips-wave]

Congratulations, @pugsley76! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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