fix: directory table multi select

platform.ts

@@ -0,0 +1,78 @@
+export enum Platform {
+	Windows = 'windows',
+	MacOS = 'macos',
+	Linux = 'linux',
+	Android = 'android',
+	iOS = 'ios'
+}
+
+// Internal global variables (computed once at module load)
+let _isWindows = false
+let _isMacOS = false
+let _isLinux = false
+let _isAndroid = false
+let _isIOS = false
+let _isMobile = false
+let _userAgent: string | undefined
+let _platform: Platform = Platform.Linux // Default fallback
+
+interface INavigator {
+	userAgent: string
+	maxTouchPoints?: number
+}
+declare const navigator: INavigator
+
+// Platform detection logic (runs once at module load)
+if (typeof navigator === "object") {
+	_userAgent = navigator.userAgent
+
+	// iOS detection (must come before macOS since iOS contains "Mac")
+	if (
+		/iPad|iPhone|iPod/.test(_userAgent) ||
+		(/Macintosh/.test(_userAgent) &&
+			navigator.maxTouchPoints &&
+			navigator.maxTouchPoints > 0)
+	) {
+		_isIOS = true
+		_platform = Platform.iOS
+		_isMobile = /iPhone|iPod/.test(_userAgent) || /Mobi/.test(_userAgent)
+	}
+	// Android detection
+	else if (/Android/.test(_userAgent)) {
+		_isAndroid = true
+		_platform = Platform.Android
+		_isMobile = true
+	}
+	// Windows detection
+	else if (/Windows/.test(_userAgent)) {
+		_isWindows = true
+		_platform = Platform.Windows
+		_isMobile = /Mobi/.test(_userAgent)
+	}
+	// macOS detection
+	else if (/Macintosh|Mac OS X/.test(_userAgent)) {
+		_isMacOS = true
+		_platform = Platform.MacOS
+		_isMobile = false
+	}
+	// Linux detection
+	else if (/Linux/.test(_userAgent)) {
+		_isLinux = true
+		_platform = Platform.Linux
+		_isMobile = /Mobi/.test(_userAgent)
+	}
+	// Fallback - check for mobile
+	else {
+		_isMobile = /Mobi/.test(_userAgent)
+	}
+}
+
+// Exported constants (computed once)
+export const isWindows = _isWindows
+export const isMacOS = _isMacOS
+export const isLinux = _isLinux
+export const isAndroid = _isAndroid
+export const isIOS = _isIOS
+export const isMobile = _isMobile
+export const platform = _platform
+export const userAgent = _userAgent