🐛 fix(shortcuts): 迁移侧边栏搜索默认快捷键

- 将旧版 Meta/Ctrl+F 一次性迁移为各平台 Meta/Ctrl+K
- 升级持久化版本并避免启动刷新重新读回旧配置
- 保留禁用状态、自定义组合及版本 18 后的 F 配置
- 补充 macOS、Windows/Linux 与旧结构回归测试

frontend/src/utils/shortcuts.test.ts

@@ -13,6 +13,7 @@ import {
   RESERVED_SHORTCUTS,
   comboToMonacoKeyBinding,
   eventToShortcut,
+  getShortcutPlatform,
   getPrimaryShortcutDisplayLabel,
   getShortcutDisplayLabel,
   getShortcutPrimaryModifierDisplayLabel,
@@ -22,6 +23,7 @@ import {
   isImeComposingKeyEvent,
   isShortcutMatch,
   isShortcutPhysicalMatch,
+  migrateLegacySidebarSearchShortcutOptions,
   resolveShortcutBinding,
   resolveShortcutDisplay,
   setGlobalShortcutCaptureActive,
@@ -578,6 +580,13 @@ describe('shortcut defaults', () => {
       mac: { combo: 'Meta+Shift+H', enabled: true },
       windows: { combo: 'Ctrl+H', enabled: true },
     });
+    expect(DEFAULT_SHORTCUT_OPTIONS.focusSidebarSearch).toEqual({
+      mac: { combo: 'Meta+K', enabled: true },
+      windows: { combo: 'Ctrl+K', enabled: true },
+    });
+    expect(getShortcutPlatform(true)).toBe('mac');
+    expect(getShortcutPlatform(false)).toBe('windows');
+    expect(getShortcutPlatform()).toBe('windows');
   });
 
   it('registers connection and AI panel actions as real shortcuts', () => {
@@ -609,6 +618,53 @@ describe('shortcut defaults', () => {
     });
   });
 
+  it('migrates legacy sidebar search defaults by platform while preserving enabled state', () => {
+    const options = migrateLegacySidebarSearchShortcutOptions({
+      focusSidebarSearch: {
+        mac: { combo: 'Meta+F', enabled: false },
+        windows: { combo: 'Ctrl+F', enabled: true },
+      },
+    });
+
+    expect(options.focusSidebarSearch).toEqual({
+      mac: { combo: 'Meta+K', enabled: false },
+      windows: { combo: 'Ctrl+K', enabled: true },
+    });
+  });
+
+  it('migrates the pre-platform Ctrl+F binding without changing other custom shortcuts', () => {
+    const options = migrateLegacySidebarSearchShortcutOptions({
+      focusSidebarSearch: { combo: 'Ctrl+F', enabled: false },
+      toggleTheme: {
+        mac: { combo: 'Meta+Shift+T', enabled: true },
+        windows: { combo: 'Ctrl+Shift+T', enabled: true },
+      },
+    });
+
+    expect(options.focusSidebarSearch).toEqual({
+      mac: { combo: 'Meta+K', enabled: false },
+      windows: { combo: 'Ctrl+K', enabled: false },
+    });
+    expect(options.toggleTheme).toEqual({
+      mac: { combo: 'Meta+Shift+T', enabled: true },
+      windows: { combo: 'Ctrl+Shift+T', enabled: true },
+    });
+  });
+
+  it('keeps non-default sidebar search shortcuts unchanged during legacy migration', () => {
+    const options = migrateLegacySidebarSearchShortcutOptions({
+      focusSidebarSearch: {
+        mac: { combo: 'Meta+P', enabled: true },
+        windows: { combo: 'Ctrl+P', enabled: false },
+      },
+    });
+
+    expect(options.focusSidebarSearch).toEqual({
+      mac: { combo: 'Meta+P', enabled: true },
+      windows: { combo: 'Ctrl+P', enabled: false },
+    });
+  });
+
   it('keeps close active tab enabled for new and empty shortcut settings', () => {
     expect(sanitizeShortcutOptions(undefined).closeActiveTab).toEqual(DEFAULT_SHORTCUT_OPTIONS.closeActiveTab);
     expect(sanitizeShortcutOptions({}).closeActiveTab).toEqual(DEFAULT_SHORTCUT_OPTIONS.closeActiveTab);

frontend/src/utils/shortcuts.ts

@@ -807,6 +807,29 @@ export const sanitizeShortcutOptions = (value: unknown): ShortcutOptions => {
   return defaults;
 };
 
+const LEGACY_SIDEBAR_SEARCH_DEFAULTS: Record<ShortcutPlatform, readonly string[]> = {
+  // The pre-platform schema stored one Ctrl+F binding and copied it into the mac slot.
+  mac: ['Meta+F', 'Ctrl+F'],
+  windows: ['Ctrl+F'],
+};
+
+export const migrateLegacySidebarSearchShortcutOptions = (value: unknown): ShortcutOptions => {
+  const options = sanitizeShortcutOptions(value);
+
+  (['mac', 'windows'] as const).forEach((platform) => {
+    const binding = options.focusSidebarSearch[platform];
+    if (!LEGACY_SIDEBAR_SEARCH_DEFAULTS[platform].includes(normalizeShortcutCombo(binding.combo))) {
+      return;
+    }
+    options.focusSidebarSearch[platform] = {
+      ...binding,
+      combo: DEFAULT_SHORTCUT_OPTIONS.focusSidebarSearch[platform].combo,
+    };
+  });
+
+  return options;
+};
+
 export const resolveShortcutBinding = (
   options: Partial<ShortcutOptions> | null | undefined,
   action: ShortcutAction,