fix(cli): add missing custom theme properties to settings schema

- Add 'text.response', 'ui.active', and 'ui.focus' to CustomTheme schema.
- Synchronize 'CustomTheme' interface in core with schema by adding 'border.focused'.
- Add validation tests for the new properties.

Fixes https://github.com/google-gemini/gemini-cli/issues/25689

packages/cli/src/config/settings-validation.test.ts

@@ -273,6 +273,36 @@ describe('settings-validation', () => {
     });
 
     it('should validate complex nested customThemes configuration', () => {
+      const validSettings = {
+        ui: {
+          customThemes: {
+            'my-theme': {
+              type: 'custom' as const,
+              name: 'My Theme',
+              text: {
+                primary: '#ffffff',
+                secondary: '#cccccc',
+                link: '#0000ff',
+                accent: '#ff00ff',
+                response: '#00ff00',
+              },
+              ui: {
+                comment: '#888888',
+                symbol: '#ffffff',
+                active: '#0000ff',
+                focus: '#00ff00',
+                gradient: ['#000000', '#ffffff'],
+              },
+            },
+          },
+        },
+      };
+
+      const result = validateSettings(validSettings);
+      expect(result.success).toBe(true);
+    });
+
+    it('should reject invalid customThemes configuration', () => {
       const invalidSettings = {
         ui: {
           customThemes: {

packages/cli/src/config/settingsSchema.ts

@@ -3118,6 +3118,7 @@ export const SETTINGS_SCHEMA_DEFINITIONS: Record<
           secondary: { type: 'string' },
           link: { type: 'string' },
           accent: { type: 'string' },
+          response: { type: 'string' },
         },
       },
       background: {
@@ -3149,6 +3150,8 @@ export const SETTINGS_SCHEMA_DEFINITIONS: Record<
         properties: {
           comment: { type: 'string' },
           symbol: { type: 'string' },
+          active: { type: 'string' },
+          focus: { type: 'string' },
           gradient: {
             type: 'array',
             items: { type: 'string' },

packages/core/src/config/config.ts

@@ -309,6 +309,7 @@ export interface CustomTheme {
   };
   border?: {
     default?: string;
+    focused?: string;
   };
   ui?: {
     comment?: string;