fix(electron): preserve unowned roots without project folders

electron/src/main/backend-setup.test.ts

@@ -418,13 +418,17 @@ it.each(['ready', 'compatible'] as const)(
   },
 );
 
-it('keeps a selected broken environment selected until explicit setup, then preserves unowned files', async () => {
+it.each([true, false])(
+  'preserves a selected unowned runtime (project exists: %s)',
+  async (projectExists) => {
     const { resolve, join } = await import('node:path');
     const selected = resolve('/selected/VoiceStudio');
     mocks.runtimeConfig = { root: selected, owned: false };
-  mocks.existingProject = true;
+    mocks.existingProject = projectExists;
     mocks.ready.mockResolvedValue(true);
-  mocks.dependencies.mockImplementation(async (project?: string) => !project?.includes('selected'));
+    mocks.dependencies.mockImplementation(
+      async (project?: string) => !project?.includes('selected'),
+    );
     mocks.install.mockRejectedValue(new Error('offline'));
     vi.stubGlobal(
       'fetch',
@@ -447,4 +451,5 @@ it('keeps a selected broken environment selected until explicit setup, then pres
     expect(mocks.rm).not.toHaveBeenCalled();
     expect(mocks.stage).not.toHaveBeenCalled();
     await supervisor.shutdown();
-});
+  },
+);

electron/src/main/backend.ts

@@ -549,8 +549,7 @@ export class BackendSupervisor extends EventEmitter<{
         configured &&
         !configured.owned &&
         samePath(configured.root, runtimeRoot) &&
-        !samePath(runtimeRoot, defaultRuntimeRoot()) &&
-        existsSync(project)
+        !samePath(runtimeRoot, defaultRuntimeRoot())
       ) {
         // An explicit setup action may create a new runtime, but must never
         // take ownership of (or repair in place) another installation's files.