feat: Add comprehensive mobile testing infrastructure

- Add test scripts for Android and iOS platforms
- Create prerequisite checker for mobile development setup
- Add device/simulator availability checks
- Update test-all command to include mobile tests
- Add granular test commands for web and mobile

The changes improve testing by:
1. Adding structured mobile test runners
2. Validating development environment setup
3. Separating web and mobile test flows
4. Adding device availability checks
5. Providing detailed test documentation

Added scripts:
- check-prerequisites.js: Validates dev environment
- test-android.js: Runs Android tests
- test-ios.js: Runs iOS tests
- run-available-mobile-tests.js: Smart platform detection

scripts/run-available-mobile-tests.js

@@ -0,0 +1,132 @@
+/**
+ * @fileoverview Runs mobile tests based on available platforms and devices
+ * 
+ * This script intelligently detects available mobile platforms and their
+ * associated devices/simulators, then runs tests only for the available
+ * configurations. This allows for flexible testing across different
+ * development environments without failing when a platform is unavailable.
+ * 
+ * Platform detection:
+ * - Android: Checks for SDK and connected devices/emulators
+ * - iOS: Checks for macOS, Xcode, and running simulators
+ * 
+ * Features:
+ * - Smart platform detection
+ * - Graceful handling of unavailable platforms
+ * - Clear logging of test execution
+ * - Comprehensive error reporting
+ * 
+ * Exit codes:
+ * - 0: Tests completed successfully on available platforms
+ * - 1: Tests failed or no platforms available
+ * 
+ * @example
+ * // Run directly
+ * node scripts/run-available-mobile-tests.js
+ * 
+ * // Run via npm script
+ * npm run test:mobile:available
+ * 
+ * @requires child_process
+ * @requires fs
+ * 
+ * @author TimeSafari Team
+ * @license MIT
+ */
+
+const { execSync } = require('child_process');
+const { existsSync } = require('fs');
+
+/**
+ * Executes mobile tests on available platforms
+ * 
+ * This function performs the following steps:
+ * 1. Checks Android environment and device availability
+ * 2. Checks iOS environment and simulator availability (on macOS)
+ * 3. Runs tests on available platforms
+ * 4. Reports results and handles errors
+ * 
+ * Platform-specific checks:
+ * Android:
+ * - ANDROID_HOME environment variable
+ * - Android platform files existence
+ * - Connected devices via ADB
+ * 
+ * iOS:
+ * - macOS operating system
+ * - iOS platform files existence
+ * - Running simulators via xcrun
+ * 
+ * @async
+ * @throws {Error} If tests fail or no platforms are available
+ * 
+ * @example
+ * runAvailableMobileTests().catch(error => {
+ *     console.error('Test execution failed:', error);
+ *     process.exit(1);
+ * });
+ */
+async function runAvailableMobileTests() {
+    try {
+        // Check Android availability
+        // Requires both SDK (ANDROID_HOME) and platform files
+        const androidAvailable = existsSync('android') && process.env.ANDROID_HOME;
+        let androidDeviceAvailable = false;
+
+        if (androidAvailable) {
+            try {
+                // Check for connected devices using ADB
+                const devices = execSync('adb devices').toString();
+                // Parse ADB output for actually connected devices
+                // Filters out unauthorized or offline devices
+                androidDeviceAvailable = devices.split('\n').slice(1).some(line => line.includes('device'));
+            } catch (e) {
+                console.log('⚠️ Android SDK available but no devices connected');
+            }
+        }
+
+        // Check iOS availability
+        // Only possible on macOS with Xcode installed
+        const iosAvailable = process.platform === 'darwin' && existsSync('ios');
+        let iosSimulatorAvailable = false;
+
+        if (iosAvailable) {
+            try {
+                // Check for running simulators using xcrun
+                const simulators = execSync('xcrun simctl list devices available').toString();
+                // Look for 'Booted' state in simulator list
+                iosSimulatorAvailable = simulators.includes('Booted');
+            } catch (e) {
+                console.log('⚠️ iOS platform available but no simulator running');
+            }
+        }
+
+        // Execute tests for available platforms
+        if (androidDeviceAvailable) {
+            console.log('🤖 Running Android tests...');
+            // Run Android tests via npm script
+            execSync('npm run test:android', { stdio: 'inherit' });
+        }
+
+        if (iosSimulatorAvailable) {
+            console.log('🍎 Running iOS tests...');
+            // Run iOS tests via npm script
+            execSync('npm run test:ios', { stdio: 'inherit' });
+        }
+
+        // Error if no platforms are available for testing
+        if (!androidDeviceAvailable && !iosSimulatorAvailable) {
+            console.error('❌ No mobile platforms available for testing');
+            process.exit(1);
+        }
+
+        console.log('✅ Available mobile tests completed successfully');
+    } catch (error) {
+        // Handle any errors during test execution
+        console.error('❌ Mobile tests failed:', error);
+        process.exit(1);
+    }
+}
+
+// Execute the test runner
+runAvailableMobileTests();