fix: prevent new projects from overriding global theme setting

When creating new projects, the theme was always explicitly set even when
matching the global theme. This caused "Use Global Theme" to be unchecked,
preventing global theme changes from affecting the project.

Now theme is only set on new projects when explicitly provided or when
recovering a trashed project's theme preference.

apps/ui/src/components/views/setup-view/steps/theme-step.tsx

@@ -24,10 +24,10 @@ export function ThemeStep({ onNext, onBack }: ThemeStepProps) {
 
   const handleThemeClick = (themeValue: string) => {
     setTheme(themeValue as typeof theme);
-    // Also update the current project's theme if one exists
-    // This ensures the selected theme is visible since getEffectiveTheme() prioritizes project theme
-    if (currentProject) {
-      setProjectTheme(currentProject.id, themeValue as typeof theme);
+    // Clear the current project's theme so it uses the global theme
+    // This ensures "Use Global Theme" is checked and the project inherits the global theme
+    if (currentProject && currentProject.theme !== undefined) {
+      setProjectTheme(currentProject.id, null);
     }
     setPreviewTheme(null);
   };

apps/ui/src/components/views/welcome-view.tsx

@@ -9,7 +9,7 @@ import {
   DialogHeader,
   DialogTitle,
 } from '@/components/ui/dialog';
-import { useAppStore, type ThemeMode } from '@/store/app-store';
+import { useAppStore } from '@/store/app-store';
 import { getElectronAPI } from '@/lib/electron';
 import { initializeProject } from '@/lib/project-init';
 import {
@@ -38,15 +38,7 @@ import { useNavigate } from '@tanstack/react-router';
 const logger = createLogger('WelcomeView');
 
 export function WelcomeView() {
-  const {
-    projects,
-    trashedProjects,
-    currentProject,
-    upsertAndSetCurrentProject,
-    addProject,
-    setCurrentProject,
-    theme: globalTheme,
-  } = useAppStore();
+  const { projects, upsertAndSetCurrentProject, addProject, setCurrentProject } = useAppStore();
   const navigate = useNavigate();
   const [showNewProjectModal, setShowNewProjectModal] = useState(false);
   const [isCreating, setIsCreating] = useState(false);
@@ -109,13 +101,8 @@ export function WelcomeView() {
         }
 
         // Upsert project and set as current (handles both create and update cases)
-        // Theme preservation is handled by the store action
-        const trashedProject = trashedProjects.find((p) => p.path === path);
-        const effectiveTheme =
-          (trashedProject?.theme as ThemeMode | undefined) ||
-          (currentProject?.theme as ThemeMode | undefined) ||
-          globalTheme;
-        upsertAndSetCurrentProject(path, name, effectiveTheme);
+        // Theme handling (trashed project recovery or undefined for global) is done by the store
+        upsertAndSetCurrentProject(path, name);
 
         // Show initialization dialog if files were created
         if (initResult.createdFiles && initResult.createdFiles.length > 0) {
@@ -150,14 +137,7 @@ export function WelcomeView() {
         setIsOpening(false);
       }
     },
-    [
-      trashedProjects,
-      currentProject,
-      globalTheme,
-      upsertAndSetCurrentProject,
-      analyzeProject,
-      navigate,
-    ]
+    [upsertAndSetCurrentProject, analyzeProject, navigate]
   );
 
   const handleOpenProject = useCallback(async () => {