fix(ui): preserve user-set session name for recipe-based chats (#9079)

Signed-off-by: Douwe Osinga <douwe@squareup.com>
Co-authored-by: Douwe Osinga <douwe@squareup.com>

ui/desktop/src/__tests__/sessions.test.ts

@@ -1,5 +1,6 @@
 import { describe, it, expect } from 'vitest';
 import { shouldShowNewChatTitle } from '../sessions';
+import { getSessionDisplayName } from '../hooks/useNavigationSessions';
 import type { Session } from '../api';
 
 // Helper to build a minimal Session object for testing.
@@ -105,3 +106,25 @@ describe('session reuse scoping (fix for #7601)', () => {
     expect(windowAOld?.id).toBe('empty-a');
   });
 });
+
+describe('getSessionDisplayName (fix for #8865)', () => {
+  it('returns the user-set name for a recipe session that has been renamed', () => {
+    const session = makeSession({
+      name: 'My Renamed Chat',
+      user_set_name: true,
+      message_count: 2,
+      recipe: { title: 'Some Recipe' } as unknown as Session['recipe'],
+    });
+    expect(getSessionDisplayName(session)).toBe('My Renamed Chat');
+  });
+
+  it('falls back to the recipe title when the user has not renamed', () => {
+    const session = makeSession({
+      name: 'auto-generated',
+      user_set_name: false,
+      message_count: 2,
+      recipe: { title: 'Some Recipe' } as unknown as Session['recipe'],
+    });
+    expect(getSessionDisplayName(session)).toBe('Some Recipe');
+  });
+});

ui/desktop/src/hooks/useNavigationSessions.ts

@@ -256,6 +256,9 @@ export function useNavigationSessions(options: UseNavigationSessionsOptions = {}
 }
 
 export function getSessionDisplayName(session: Session): string {
+  if (session.user_set_name) {
+    return session.name;
+  }
   if (session.recipe?.title) {
     return session.recipe.title;
   }