fix: add usetoast mock for persistence tests and update textarea styling

Add missing primevue/usetoast mock to useWorkflowPersistence.test.ts

Update Textarea to use design system tokens (rounded-lg, bg-secondary-background, text-base-foreground, ring-border-default, disabled:pointer-events-none)

Amp-Thread-ID: https://ampcode.com/threads/T-019cb14e-7cd5-7639-a48d-9e240e6f8224
Co-authored-by: Amp <amp@ampcode.com>

src/components/ui/textarea/Textarea.vue

@@ -16,7 +16,7 @@ const modelValue = defineModel<string | number>()
     v-model="modelValue"
     :class="
       cn(
-        'flex min-h-16 w-full rounded-md border border-input bg-transparent px-3 py-2 text-sm shadow-xs placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50',
+        'flex min-h-16 w-full rounded-lg border-none bg-secondary-background px-3 py-2 text-sm text-base-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-border-default disabled:pointer-events-none disabled:opacity-50',
         className
       )
     "

src/platform/workflow/persistence/composables/useWorkflowPersistence.test.ts

@@ -37,6 +37,12 @@ vi.mock('primevue', () => ({
   })
 }))
 
+vi.mock('primevue/usetoast', () => ({
+  useToast: () => ({
+    add: mockToastAdd
+  })
+}))
+
 vi.mock('vue-i18n', async (importOriginal) => {
   const actual = await importOriginal<typeof I18n>()
   return {