chore: phase 2 and 3 refactors

tests/renderer/navigation/sidebarViewRegistry.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, it } from 'vitest';
+import {
+  DEFAULT_SIDEBAR_VIEW,
+  SIDEBAR_VIEW_REGISTRY,
+  isSidebarView,
+} from '../../../src/renderer/navigation/sidebarViewRegistry';
+
+describe('sidebarViewRegistry', () => {
+  it('defines all supported sidebar views in one canonical registry', () => {
+    expect(SIDEBAR_VIEW_REGISTRY).toEqual([
+      'posts',
+      'pages',
+      'media',
+      'settings',
+      'tags',
+      'chat',
+      'import',
+      'git',
+    ]);
+  });
+
+  it('uses posts as default sidebar view', () => {
+    expect(DEFAULT_SIDEBAR_VIEW).toBe('posts');
+  });
+
+  it('validates sidebar view values', () => {
+    expect(isSidebarView('tags')).toBe(true);
+    expect(isSidebarView('unknown')).toBe(false);
+  });
+});