[Good First Issue] Add dark mode toggle to mobile app

[Dapappa]

Points: 100

Add a dark mode toggle to the mobile app settings screen.

Requirements:

• Toggle switch in settings menu
• Persist user preference in AsyncStorage
• Update theme context/provider
• Apply dark mode colors to all screens

Files to modify:

• /apps/mobile/src/contexts/ThemeContext.tsx
• /apps/mobile/src/screens/SettingsScreen.tsx
• /apps/mobile/src/styles/colors.ts

Testing:

• Toggle persists across app restarts
• All screens support dark mode
• No visual glitches during theme switch

---

Want to work on this?

1. Comment "I'd like to work on this!" to claim
2. Wait for maintainer approval
3. Fork the repo and create a branch
4. Submit a PR when ready

Questions? Ask on Discord

🇳🇬 Part of Code for Change - Building technology that saves lives!