make Vue nodes' outputs/previews responsively sized and work with node resizing (#5970)

## Summary

Added dedicated component for sampling previews and change all image
outputs (outputs, videos, previews) to be responsive and respond to node
resizing.



https://github.com/user-attachments/assets/7e683d32-4914-460c-ba08-4573c40aef24

## Changes

- **What**: Implemented `LivePreview` component for mid-execution
sampling visualization with responsive layout system
- **Dependencies**: Added resize handle composable and transform state
integration

## Review Focus

Node resize interaction conflicts with canvas dragging, and image
dimension calculation performance during rapid sampling updates.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5970-make-Vue-nodes-outputs-previews-responsively-sized-and-work-with-node-resizing-2866d73d365081508d53e6e286a9a3fe)
by [Unito](https://www.unito.io)

---------

Co-authored-by: DrJKL <DrJKL@users.noreply.github.com>
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: github-actions <github-actions@github.com>

tests-ui/tests/renderer/extensions/vueNodes/components/LivePreview.test.ts

@@ -0,0 +1,134 @@
+import { createTestingPinia } from '@pinia/testing'
+import { mount } from '@vue/test-utils'
+import { describe, expect, it, vi } from 'vitest'
+import { nextTick } from 'vue'
+import { createI18n } from 'vue-i18n'
+
+import LivePreview from '@/renderer/extensions/vueNodes/components/LivePreview.vue'
+
+const i18n = createI18n({
+  legacy: false,
+  locale: 'en',
+  messages: {
+    en: {
+      g: {
+        liveSamplingPreview: 'Live sampling preview',
+        imageFailedToLoad: 'Image failed to load',
+        errorLoadingImage: 'Error loading image',
+        calculatingDimensions: 'Calculating dimensions'
+      }
+    }
+  }
+})
+
+describe('LivePreview', () => {
+  const defaultProps = {
+    imageUrl: '/api/view?filename=test_sample.png&type=temp'
+  }
+
+  const mountLivePreview = (props = {}) => {
+    return mount(LivePreview, {
+      props: { ...defaultProps, ...props },
+      global: {
+        plugins: [
+          createTestingPinia({
+            createSpy: vi.fn
+          }),
+          i18n
+        ],
+        stubs: {
+          'i-lucide:image-off': true
+        }
+      }
+    })
+  }
+
+  it('renders preview when imageUrl provided', () => {
+    const wrapper = mountLivePreview()
+
+    expect(wrapper.find('img').exists()).toBe(true)
+    expect(wrapper.find('img').attributes('src')).toBe(defaultProps.imageUrl)
+  })
+
+  it('does not render when no imageUrl provided', () => {
+    const wrapper = mountLivePreview({ imageUrl: null })
+
+    expect(wrapper.find('img').exists()).toBe(false)
+    expect(wrapper.text()).toBe('')
+  })
+
+  it('displays calculating dimensions text initially', () => {
+    const wrapper = mountLivePreview()
+
+    expect(wrapper.text()).toContain('Calculating dimensions')
+  })
+
+  it('has proper accessibility attributes', () => {
+    const wrapper = mountLivePreview()
+
+    const img = wrapper.find('img')
+    expect(img.attributes('alt')).toBe('Live sampling preview')
+  })
+
+  it('handles image load event', async () => {
+    const wrapper = mountLivePreview()
+    const img = wrapper.find('img')
+
+    // Mock the naturalWidth and naturalHeight properties on the img element
+    Object.defineProperty(img.element, 'naturalWidth', {
+      writable: false,
+      value: 512
+    })
+    Object.defineProperty(img.element, 'naturalHeight', {
+      writable: false,
+      value: 512
+    })
+
+    // Trigger the load event
+    await img.trigger('load')
+
+    expect(wrapper.text()).toContain('512 x 512')
+  })
+
+  it('handles image error state', async () => {
+    const wrapper = mountLivePreview()
+    const img = wrapper.find('img')
+
+    // Trigger the error event
+    await img.trigger('error')
+
+    // Check that the image is hidden and error content is shown
+    expect(wrapper.find('img').exists()).toBe(false)
+    expect(wrapper.text()).toContain('Image failed to load')
+  })
+
+  it('resets state when imageUrl changes', async () => {
+    const wrapper = mountLivePreview()
+    const img = wrapper.find('img')
+
+    // Set error state via event
+    await img.trigger('error')
+    expect(wrapper.text()).toContain('Error loading image')
+
+    // Change imageUrl prop
+    await wrapper.setProps({ imageUrl: '/new-image.png' })
+    await nextTick()
+
+    // State should be reset - dimensions text should show calculating
+    expect(wrapper.text()).toContain('Calculating dimensions')
+    expect(wrapper.text()).not.toContain('Error loading image')
+  })
+
+  it('shows error state when image fails to load', async () => {
+    const wrapper = mountLivePreview()
+    const img = wrapper.find('img')
+
+    // Trigger error event
+    await img.trigger('error')
+
+    // Should show error state instead of image
+    expect(wrapper.find('img').exists()).toBe(false)
+    expect(wrapper.text()).toContain('Image failed to load')
+    expect(wrapper.text()).toContain('Error loading image')
+  })
+})