feat: add provider logo overlays to workflow template thumbnails

- Add LogoInfo interface and logos field to TemplateInfo type
- Create LogoOverlay.vue component for rendering positioned logos
- Fetch logo index from templates/index_logo.json in store
- Add getLogoUrl helper to useTemplateWorkflows composable
- Integrate LogoOverlay into WorkflowTemplateSelectorDialog

Supports multiple logos per template with configurable:
- Position (Tailwind classes)
- Size (sm/md/lg)
- Opacity (0-1)

Templates can declare logos explicitly. Logo assets are fetched
from the workflow_templates repo (templates/logo/*.png).

Amp-Thread-ID: https://ampcode.com/threads/T-019c03a1-9f05-70bd-b0a3-2848e54e04af
Co-authored-by: Amp <amp@ampcode.com>

src/components/custom/widget/WorkflowTemplateSelectorDialog.vue

@@ -251,6 +251,11 @@
                         "
                       />
                     </template>
+                    <LogoOverlay
+                      v-if="template.logos?.length"
+                      :logos="template.logos"
+                      :get-logo-url="getLogoUrl"
+                    />
                     <ProgressSpinner
                       v-if="loadingTemplate === template.name"
                       class="absolute inset-0 z-10 m-auto h-12 w-12"
@@ -392,6 +397,7 @@ import AudioThumbnail from '@/components/templates/thumbnails/AudioThumbnail.vue
 import CompareSliderThumbnail from '@/components/templates/thumbnails/CompareSliderThumbnail.vue'
 import DefaultThumbnail from '@/components/templates/thumbnails/DefaultThumbnail.vue'
 import HoverDissolveThumbnail from '@/components/templates/thumbnails/HoverDissolveThumbnail.vue'
+import LogoOverlay from '@/components/templates/thumbnails/LogoOverlay.vue'
 import Button from '@/components/ui/button/Button.vue'
 import BaseModalLayout from '@/components/widget/layout/BaseModalLayout.vue'
 import LeftSidePanel from '@/components/widget/panel/LeftSidePanel.vue'
@@ -472,7 +478,8 @@ const {
   loadWorkflowTemplate,
   getTemplateThumbnailUrl,
   getTemplateTitle,
-  getTemplateDescription
+  getTemplateDescription,
+  getLogoUrl
 } = useTemplateWorkflows()
 
 const getEffectiveSourceModule = (template: TemplateInfo) =>

src/components/templates/thumbnails/LogoOverlay.test.ts

@@ -0,0 +1,95 @@
+import { mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+
+import LogoOverlay from '@/components/templates/thumbnails/LogoOverlay.vue'
+import type { LogoInfo } from '@/platform/workflow/templates/types/template'
+
+describe('LogoOverlay', () => {
+  const mockGetLogoUrl = (provider: string) => `/logos/${provider}.png`
+
+  const mountOverlay = (logos: LogoInfo[], props = {}) => {
+    return mount(LogoOverlay, {
+      props: {
+        logos,
+        getLogoUrl: mockGetLogoUrl,
+        ...props
+      }
+    })
+  }
+
+  it('renders nothing when logos array is empty', () => {
+    const wrapper = mountOverlay([])
+    expect(wrapper.findAll('img')).toHaveLength(0)
+  })
+
+  it('renders a logo with correct src and alt', () => {
+    const wrapper = mountOverlay([{ provider: 'Google' }])
+    const img = wrapper.find('img')
+    expect(img.attributes('src')).toBe('/logos/Google.png')
+    expect(img.attributes('alt')).toBe('Google')
+  })
+
+  it('renders multiple logos', () => {
+    const wrapper = mountOverlay([
+      { provider: 'Google' },
+      { provider: 'OpenAI' },
+      { provider: 'Stability' }
+    ])
+    expect(wrapper.findAll('img')).toHaveLength(3)
+  })
+
+  it('applies default position when not specified', () => {
+    const wrapper = mountOverlay([{ provider: 'Google' }])
+    const container = wrapper.find('div')
+    expect(container.classes()).toContain('bottom-2')
+    expect(container.classes()).toContain('right-2')
+  })
+
+  it('applies custom position from logo config', () => {
+    const wrapper = mountOverlay([
+      { provider: 'Google', position: 'top-2 left-2' }
+    ])
+    const container = wrapper.find('div')
+    expect(container.classes()).toContain('top-2')
+    expect(container.classes()).toContain('left-2')
+  })
+
+  it('applies default medium size class', () => {
+    const wrapper = mountOverlay([{ provider: 'Google' }])
+    const img = wrapper.find('img')
+    expect(img.classes()).toContain('h-8')
+    expect(img.classes()).toContain('w-8')
+  })
+
+  it('applies small size class', () => {
+    const wrapper = mountOverlay([{ provider: 'Google', size: 'sm' }])
+    const img = wrapper.find('img')
+    expect(img.classes()).toContain('h-6')
+    expect(img.classes()).toContain('w-6')
+  })
+
+  it('applies large size class', () => {
+    const wrapper = mountOverlay([{ provider: 'Google', size: 'lg' }])
+    const img = wrapper.find('img')
+    expect(img.classes()).toContain('h-12')
+    expect(img.classes()).toContain('w-12')
+  })
+
+  it('applies default opacity', () => {
+    const wrapper = mountOverlay([{ provider: 'Google' }])
+    const container = wrapper.find('div')
+    expect(container.attributes('style')).toContain('opacity: 0.9')
+  })
+
+  it('applies custom opacity', () => {
+    const wrapper = mountOverlay([{ provider: 'Google', opacity: 0.5 }])
+    const container = wrapper.find('div')
+    expect(container.attributes('style')).toContain('opacity: 0.5')
+  })
+
+  it('images are not draggable', () => {
+    const wrapper = mountOverlay([{ provider: 'Google' }])
+    const img = wrapper.find('img')
+    expect(img.attributes('draggable')).toBe('false')
+  })
+})

src/components/templates/thumbnails/LogoOverlay.vue

@@ -0,0 +1,39 @@
+<template>
+  <div
+    v-for="(logo, index) in logos"
+    :key="index"
+    :class="
+      cn('pointer-events-none absolute', logo.position ?? defaultPosition)
+    "
+    :style="{ opacity: logo.opacity ?? 0.9 }"
+  >
+    <img
+      :src="getLogoUrl(logo.provider)"
+      :alt="logo.provider"
+      :class="sizeClasses[logo.size ?? 'md']"
+      class="drop-shadow-md"
+      draggable="false"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import type { LogoInfo } from '@/platform/workflow/templates/types/template'
+import { cn } from '@/utils/tailwindUtil'
+
+const {
+  logos,
+  getLogoUrl,
+  defaultPosition = 'bottom-2 right-2'
+} = defineProps<{
+  logos: LogoInfo[]
+  getLogoUrl: (provider: string) => string
+  defaultPosition?: string
+}>()
+
+const sizeClasses: Record<'sm' | 'md' | 'lg', string> = {
+  sm: 'h-6 w-6',
+  md: 'h-8 w-8',
+  lg: 'h-12 w-12'
+}
+</script>

src/platform/workflow/templates/composables/useTemplateWorkflows.ts

@@ -158,7 +158,6 @@ export function useTemplateWorkflows() {
    */
   const fetchTemplateJson = async (id: string, sourceModule: string) => {
     if (sourceModule === 'default') {
-      // Default templates provided by frontend are served on this separate endpoint
       return fetch(api.fileURL(`/templates/${id}.json`)).then((r) => r.json())
     } else {
       return fetch(
@@ -167,6 +166,13 @@ export function useTemplateWorkflows() {
     }
   }
 
+  /**
+   * Gets logo URL for a provider name
+   */
+  const getLogoUrl = (provider: string): string => {
+    return workflowTemplatesStore.getLogoUrl(provider)
+  }
+
   return {
     // State
     selectedTemplate,
@@ -183,6 +189,7 @@ export function useTemplateWorkflows() {
     getTemplateThumbnailUrl,
     getTemplateTitle,
     getTemplateDescription,
-    loadWorkflowTemplate
+    loadWorkflowTemplate,
+    getLogoUrl
   }
 }

src/platform/workflow/templates/repositories/workflowTemplatesStore.ts

@@ -9,6 +9,7 @@ import { generateCategoryId, getCategoryIcon } from '@/utils/categoryUtil'
 import { normalizeI18nKey } from '@/utils/formatUtil'
 
 import type {
+  LogoIndex,
   TemplateGroup,
   TemplateInfo,
   WorkflowTemplates
@@ -31,6 +32,7 @@ export const useWorkflowTemplatesStore = defineStore(
     const customTemplates = shallowRef<{ [moduleName: string]: string[] }>({})
     const coreTemplates = shallowRef<WorkflowTemplates[]>([])
     const englishTemplates = shallowRef<WorkflowTemplates[]>([])
+    const logoIndex = shallowRef<LogoIndex>({})
     const isLoaded = ref(false)
     const knownTemplateNames = ref(new Set<string>())
 
@@ -475,15 +477,18 @@ export const useWorkflowTemplatesStore = defineStore(
           customTemplates.value = await api.getWorkflowTemplates()
           const locale = i18n.global.locale.value
 
-          const [coreResult, englishResult] = await Promise.all([
-            api.getCoreWorkflowTemplates(locale),
-            isCloud && locale !== 'en'
-              ? api.getCoreWorkflowTemplates('en')
-              : Promise.resolve([])
-          ])
+          const [coreResult, englishResult, logoIndexResult] =
+            await Promise.all([
+              api.getCoreWorkflowTemplates(locale),
+              isCloud && locale !== 'en'
+                ? api.getCoreWorkflowTemplates('en')
+                : Promise.resolve([]),
+              fetchLogoIndex()
+            ])
 
           coreTemplates.value = coreResult
           englishTemplates.value = englishResult
+          logoIndex.value = logoIndexResult
 
           const coreNames = coreTemplates.value.flatMap((category) =>
             category.templates.map((template) => template.name)
@@ -498,6 +503,22 @@ export const useWorkflowTemplatesStore = defineStore(
       }
     }
 
+    async function fetchLogoIndex(): Promise<LogoIndex> {
+      try {
+        const response = await fetch(api.fileURL('/templates/index_logo.json'))
+        if (!response.ok) return {}
+        return await response.json()
+      } catch {
+        return {}
+      }
+    }
+
+    function getLogoUrl(provider: string): string {
+      const logoPath = logoIndex.value[provider]
+      if (!logoPath) return ''
+      return api.fileURL(`/templates/${logoPath}`)
+    }
+
     function getEnglishMetadata(templateName: string): {
       tags?: string[]
       category?: string
@@ -534,7 +555,8 @@ export const useWorkflowTemplatesStore = defineStore(
       loadWorkflowTemplates,
       knownTemplateNames,
       getTemplateByName,
-      getEnglishMetadata
+      getEnglishMetadata,
+      getLogoUrl
     }
   }
 )

src/platform/workflow/templates/types/template.ts

@@ -1,3 +1,16 @@
+export interface LogoInfo {
+  /** Provider name matching index_logo.json */
+  provider: string
+  /** Tailwind positioning classes */
+  position?: string
+  /** Size: 'sm' (24px), 'md' (32px), 'lg' (48px) */
+  size?: 'sm' | 'md' | 'lg'
+  /** Opacity 0-1, default 0.9 */
+  opacity?: number
+}
+
+export type LogoIndex = Record<string, string>
+
 export interface TemplateInfo {
   name: string
   /**
@@ -47,6 +60,10 @@ export interface TemplateInfo {
    * If not specified, the template will be included on all distributions.
    */
   includeOnDistributions?: TemplateIncludeOnDistributionEnum[]
+  /**
+   * Logo overlays to display on the template thumbnail.
+   */
+  logos?: LogoInfo[]
 }
 
 export enum TemplateIncludeOnDistributionEnum {