feat: account management overhaul + 7 issue resolutions (#147)

- Add smart JSON export/import with schema validation and deduplication
- Add per-account proxy configurations (Issue #79)
- Add advanced account sorting engine (Issues #126 & #99)
- Add compact horizontal layout, AI credits, inline model visibility (Issues #145 & #134)
- Add desktop push notifications for low quota (Issue #53)
- Fix Arch Linux AUR process detection bug (Issue #117)
- Default theme set to Dark Mode (it's better)
- UI Polishing: Improved sort dropdown and symmetrical dialog layouts
- Dev Mode: Resolved port conflicts and single-instance locks
- Updated README and README.zh-CN with new features

src/tests/unit/proxy-controller.integration.test.ts

@@ -260,8 +260,12 @@ describe('ProxyController Integration', () => {
     );
 
     const callArg = proxyService.handleChatCompletions.mock.calls[0][0];
-    const assistantMessage = callArg.messages.find((message: { role: string }) => message.role === 'assistant');
-    const toolMessage = callArg.messages.find((message: { role: string }) => message.role === 'tool');
+    const assistantMessage = callArg.messages.find(
+      (message: { role: string }) => message.role === 'assistant',
+    );
+    const toolMessage = callArg.messages.find(
+      (message: { role: string }) => message.role === 'tool',
+    );
 
     expect(assistantMessage?.tool_calls?.[0]?.function?.name).toBe('builtin_web_search');
     expect(toolMessage?.name).toBe('builtin_web_search');