feat(keybindings): 快捷键自定义系统 — store+冲突检测+交互式重新绑定UI | 13 files +1032/-137 | 72 tests passing tsc零错误

test/setup.ts

@@ -37,6 +37,8 @@ const mockElectronAPI = {
   // Settings
   getSettings: vi.fn().mockResolvedValue({ success: true, settings: {} }),
   setSettings: vi.fn().mockResolvedValue({ success: true }),
+  settingsGet: vi.fn().mockResolvedValue({ success: true, value: undefined }),
+  settingsSet: vi.fn().mockResolvedValue({ success: true }),
 
   // Dialog
   showSaveDialog: vi.fn().mockResolvedValue({ success: true, canceled: false, filePath: '/tmp/test' }),