[test] Add Vue Node header component test (#5457)

* add node header component test

* [refactor] use separate const declarations instead of mutable variable in test - addresses @DrJKL's code style suggestion

Replace mutable `let icon` with descriptive `const expandedIcon` and `const collapsedIcon`
variables for better code clarity and immutability in the chevron icon test.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* [config] remove unnecessary vitest exclude patterns - addresses @DrJKL's configuration review

Remove redundant exclude patterns from vitest config as they are already covered by
vitest's default exclusions. Simplifies configuration while maintaining functionality.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* [config] remove unnecessary vitest exclude patterns - addresses @DrJKL's configuration review

Remove redundant exclude patterns from vitest config as they are already covered by
vitest's default exclusions. Simplifies configuration while maintaining functionality.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/renderer/extensions/vueNodes/components/NodeHeader.spec.ts

@@ -0,0 +1,129 @@
+import { mount } from '@vue/test-utils'
+import { createPinia } from 'pinia'
+import PrimeVue from 'primevue/config'
+import InputText from 'primevue/inputtext'
+import { describe, expect, it } from 'vitest'
+import { createI18n } from 'vue-i18n'
+
+import type { VueNodeData } from '@/composables/graph/useGraphNodeManager'
+import enMessages from '@/locales/en/main.json'
+
+import NodeHeader from './NodeHeader.vue'
+
+const makeNodeData = (overrides: Partial<VueNodeData> = {}): VueNodeData => ({
+  id: '1',
+  title: 'KSampler',
+  type: 'KSampler',
+  mode: 0,
+  selected: false,
+  executing: false,
+  widgets: [],
+  inputs: [],
+  outputs: [],
+  flags: { collapsed: false },
+  ...overrides
+})
+
+const mountHeader = (
+  props?: Partial<InstanceType<typeof NodeHeader>['$props']>
+) => {
+  const i18n = createI18n({
+    legacy: false,
+    locale: 'en',
+    messages: { en: enMessages }
+  })
+  return mount(NodeHeader, {
+    global: {
+      plugins: [PrimeVue, i18n, createPinia()],
+      components: { InputText }
+    },
+    props: {
+      nodeData: makeNodeData(),
+      readonly: false,
+      collapsed: false,
+      ...props
+    }
+  })
+}
+
+describe('NodeHeader.vue', () => {
+  it('emits collapse when collapse button is clicked', async () => {
+    const wrapper = mountHeader()
+    const btn = wrapper.get('[data-testid="node-collapse-button"]')
+    await btn.trigger('click')
+    expect(wrapper.emitted('collapse')).toBeTruthy()
+  })
+
+  it('shows the current node title and updates when prop changes', async () => {
+    const wrapper = mountHeader({
+      nodeData: makeNodeData({ title: 'Original' })
+    })
+    // Title visible via EditableText in view mode
+    expect(wrapper.get('[data-testid="node-title"]').text()).toContain(
+      'Original'
+    )
+
+    // Update prop title; should sync displayTitle
+    await wrapper.setProps({ nodeData: makeNodeData({ title: 'Updated' }) })
+    expect(wrapper.get('[data-testid="node-title"]').text()).toContain(
+      'Updated'
+    )
+  })
+
+  it('allows renaming via double click and emits update:title on confirm', async () => {
+    const wrapper = mountHeader({ nodeData: makeNodeData({ title: 'Start' }) })
+
+    // Enter edit mode
+    await wrapper.get('[data-testid="node-header-1"]').trigger('dblclick')
+
+    // Edit and confirm (EditableText uses blur or enter to emit)
+    const input = wrapper.get('[data-testid="node-title-input"]')
+    await input.setValue('My Custom Sampler')
+    await input.trigger('keyup.enter')
+    await input.trigger('blur')
+
+    // NodeHeader should emit update:title with trimmed value
+    const e = wrapper.emitted('update:title')
+    expect(e).toBeTruthy()
+    expect(e?.[0]).toEqual(['My Custom Sampler'])
+  })
+
+  it('cancels rename on escape and keeps previous title', async () => {
+    const wrapper = mountHeader({ nodeData: makeNodeData({ title: 'KeepMe' }) })
+
+    await wrapper.get('[data-testid="node-header-1"]').trigger('dblclick')
+    const input = wrapper.get('[data-testid="node-title-input"]')
+    await input.setValue('Should Not Save')
+    await input.trigger('keyup.escape')
+
+    // Should not emit update:title
+    expect(wrapper.emitted('update:title')).toBeFalsy()
+
+    // Title remains the original
+    expect(wrapper.get('[data-testid="node-title"]').text()).toContain('KeepMe')
+  })
+
+  it('honors readonly: hides collapse button and prevents editing', async () => {
+    const wrapper = mountHeader({ readonly: true })
+
+    // Collapse button should be hidden
+    const btn = wrapper.find('[data-testid="node-collapse-button"]')
+    expect(btn.exists()).toBe(true)
+    // v-show hides via display:none
+    expect((btn.element as HTMLButtonElement).style.display).toBe('none')
+    // In unit test, presence is fine; simulate double click should not create input
+    await wrapper.get('[data-testid="node-header-1"]').trigger('dblclick')
+    const input = wrapper.find('[data-testid="node-title-input"]')
+    expect(input.exists()).toBe(false)
+  })
+
+  it('renders correct chevron icon based on collapsed prop', async () => {
+    const wrapper = mountHeader({ collapsed: false })
+    const expandedIcon = wrapper.get('i')
+    expect(expandedIcon.classes()).toContain('pi-chevron-down')
+
+    await wrapper.setProps({ collapsed: true })
+    const collapsedIcon = wrapper.get('i')
+    expect(collapsedIcon.classes()).toContain('pi-chevron-right')
+  })
+})