Function detectPlatform

detectPlatform(): PlatformInfo
Detect device type and platform information

Combines multiple detection methods for reliability:
1. User-agent string analysis (most reliable for device type)
2. Screen dimensions
3. Touch capability
This ensures mobile controls are shown on:
- Standard mobile phones (< 768px width)
- High-resolution phones (>= 768px width but mobile user-agent)
- Tablets (user preference via touch support)
Results are cached to avoid re-parsing user-agent on every call. Cache is invalidated when screen dimensions change.
Returns PlatformInfo
Complete platform information
Example
```
const platform = detectPlatform();

if (platform.isMobile) {
  // Show mobile controls
  return <MobileControls />;
}
```
Korean
플랫폼감지
- Defined in utils/deviceDetection.ts:261