Fix Android safe-area handling and window maximization

- Fix extension signature verification on Android by canonicalizing paths (symlink compatibility)
- Implement proper safe-area-inset handling for mobile devices
- Add reactive header height measurement to UI store
- Fix maximized window positioning to respect safe-areas and header
- Create reusable HaexDebugOverlay component for mobile debugging
- Fix Swiper navigation by using absolute positioning instead of flex-1
- Remove debug logging after Android compatibility confirmed

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/stores/ui/index.ts

@@ -69,10 +69,12 @@ export const useUiStore = defineStore('uiStore', () => {
   })
 
   const viewportHeightWithoutHeader = ref(0)
+  const headerHeight = ref(0)
 
   return {
     availableThemes,
     viewportHeightWithoutHeader,
+    headerHeight,
     currentTheme,
     currentThemeName,
     defaultTheme,