Fix blank screen on detail view for projects with no filesystem paths

packages/app/e2e/app.spec.ts

@@ -256,6 +256,49 @@ args = ["other.js"]
     }
   })
 
+  test('opens the detail view for a project with no filesystem paths', async () => {
+    // Regression: core's toFull omits `paths` for path-less projects (trips,
+    // partnerships). ProjectDetailView read `project.paths.length` unguarded,
+    // which threw and — with no error boundary — blanked the whole app.
+    const home = mkdtempSync(resolve(tmpdir(), 'setlist-e2e-pathless-home-'))
+    const dbPath = join(home, 'registry.db')
+    const app = await electron.launch({
+      args: [MAIN_ENTRY],
+      env: { ...process.env, HOME: home, SETLIST_APP_DB_PATH: dbPath }
+    })
+
+    try {
+      const window = await app.firstWindow()
+      await window.waitForLoadState('domcontentloaded')
+
+      await window.evaluate(() => window.setlist.register({
+        name: 'pathless-trip',
+        display_name: 'Pathless Trip',
+        type: 'project',
+        status: 'active',
+        description: 'A trip with no filesystem path'
+      }))
+      await window.reload()
+      await window.waitForLoadState('domcontentloaded')
+
+      // Click the project card on the Home view.
+      await window.getByRole('button', { name: /Pathless Trip/ }).first().click()
+
+      // The detail view must render, not blank out: header heading + the tab
+      // strip (which only exists in the detail view) confirm the tree mounted.
+      await expect(window.getByRole('heading', { name: 'Pathless Trip' }).first()).toBeVisible()
+      await expect(window.getByRole('tab', { name: 'Overview' })).toBeVisible()
+      // The error boundary must not have caught a render throw.
+      await expect(window.getByText('Something went wrong rendering this view')).toHaveCount(0)
+      // Force-exit before teardown: menu-bar persistence makes window close
+      // hide rather than quit, so app.close() can hang waiting for process exit.
+      await app.evaluate(({ app }) => app.exit(0)).catch(() => {})
+    } finally {
+      await app.close()
+      rmSync(home, { recursive: true, force: true })
+    }
+  })
+
   test('reassigns projects before deleting a project type from Settings', async () => {
     const home = mkdtempSync(resolve(tmpdir(), 'setlist-e2e-type-delete-home-'))
     const dbPath = join(home, 'registry.db')