feat: Centralize browser instance creation to eliminate duplication in Desktop and Mobile flows

fix: Update error message for HTTP 400 checks to English
refactor: Improve logging for network idle wait timeout in Workers
fix: Initialize lastError in Axios client to prevent undefined errors
chore: Update tsconfig to include path mappings for better module resolution

src/util/Axios.ts

@@ -87,7 +87,8 @@ class AxiosClient {
             return bypassInstance.request(config)
         }
 
-        let lastError: unknown
+        // FIXED: Initialize lastError to prevent throwing undefined
+        let lastError: unknown = new Error('Request failed with unknown error')
         const maxAttempts = 2
         
         for (let attempt = 1; attempt <= maxAttempts; attempt++) {

src/util/BrowserFactory.ts

@@ -0,0 +1,33 @@
+/**
+ * Browser Factory Utility
+ * Eliminates code duplication between Desktop and Mobile flows
+ * 
+ * Centralized browser instance creation logic
+ */
+
+import type { BrowserContext } from 'rebrowser-playwright'
+import type { MicrosoftRewardsBot } from '../index'
+import type { AccountProxy } from '../interface/Account'
+
+/**
+ * Create a browser instance for the given account
+ * IMPROVEMENT: Extracted from DesktopFlow and MobileFlow to eliminate duplication
+ * 
+ * @param bot Bot instance
+ * @param proxy Account proxy configuration
+ * @param email Account email for session naming
+ * @returns Browser context ready to use
+ * 
+ * @example
+ * const browser = await createBrowserInstance(bot, account.proxy, account.email)
+ */
+export async function createBrowserInstance(
+    bot: MicrosoftRewardsBot, 
+    proxy: AccountProxy, 
+    email: string
+): Promise<BrowserContext> {
+    const browserModule = await import('../browser/Browser')
+    const Browser = browserModule.default
+    const browserInstance = new Browser(bot)
+    return await browserInstance.createBrowser(proxy, email)
+}