Replaced "Dashboard" text with app logo image in header:
- Import Image component from react-native
- Replace Text with Image (icon.png) in both header states
- Add logo style: 36x36px with horizontal margins
- Remove unused headerTitle and headerTitleWithBack styles
- Refresh button now uses marginLeft: 'auto' for proper spacing
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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