feat(recipes): restore Copy Recipe Syntax button in recipe modal header

- Add an icon-only copy button next to Send to ComfyUI in the header
  actions row, styled as a textless variant of the neighboring pill
  buttons
- Restore fetchAndCopyRecipeSyntax() wiring against the existing
  /api/lm/recipe/{id}/syntax endpoint (context menu action unaffected)
- Add recipes.actions.copyRecipeSyntax i18n key, reusing the existing
  per-locale translations of the identical context menu string
- Sync modal test fixtures and add copySyntax tests

tests/frontend/components/recipeModal.copySyntax.test.js

@@ -0,0 +1,132 @@
+import { describe, it, beforeEach, afterEach, expect, vi } from 'vitest';
+
+const showToastMock = vi.fn();
+const copyToClipboardMock = vi.fn();
+const translateMock = vi.fn((key, params, fallback) => (typeof fallback === 'string' ? fallback : key));
+
+const loadingManagerStub = {
+  showSimpleLoading: vi.fn(),
+  hide: vi.fn(),
+  show: vi.fn(),
+  restoreProgressBar: vi.fn(),
+};
+
+const stateStub = {
+  global: { settings: {}, loadingManager: loadingManagerStub },
+  loadingManager: loadingManagerStub,
+  virtualScroller: { updateSingleItem: vi.fn() },
+};
+
+vi.mock('../../../static/js/utils/uiHelpers.js', () => ({
+  showToast: showToastMock,
+  copyToClipboard: copyToClipboardMock,
+  sendLoraToWorkflow: vi.fn(),
+  sendModelPathToWorkflow: vi.fn(),
+  openCivitaiByMetadata: vi.fn(),
+  stripLoraTags: vi.fn((text) => text),
+  sendPromptToWorkflow: vi.fn(),
+  sendGenParamsToWorkflow: vi.fn(),
+}));
+
+vi.mock('../../../static/js/utils/i18nHelpers.js', () => ({
+  translate: translateMock,
+}));
+
+vi.mock('../../../static/js/state/index.js', () => ({
+  state: stateStub,
+}));
+
+vi.mock('../../../static/js/utils/storageHelpers.js', () => ({
+  setSessionItem: vi.fn(),
+  removeSessionItem: vi.fn(),
+  getStorageItem: vi.fn(() => null),
+  setStorageItem: vi.fn(),
+}));
+
+vi.mock('../../../static/js/api/recipeApi.js', () => ({
+  fetchRecipeDetails: vi.fn(),
+  updateRecipeMetadata: vi.fn(() => Promise.resolve({ success: true })),
+  sendRecipeWorkflow: vi.fn(),
+}));
+
+vi.mock('../../../static/js/api/apiConfig.js', () => ({
+  MODEL_TYPES: {
+    LORA: 'loras',
+    CHECKPOINT: 'checkpoints',
+    EMBEDDING: 'embeddings',
+  },
+}));
+
+async function flushAsyncTasks() {
+  await Promise.resolve();
+  await new Promise((resolve) => setTimeout(resolve, 0));
+}
+
+async function createRecipeModal() {
+  const { RecipeModal } = await import('../../../static/js/components/RecipeModal.js');
+  return new RecipeModal();
+}
+
+describe('RecipeModal copy recipe syntax', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    document.body.innerHTML = `
+      <div class="recipe-header-actions" id="recipeHeaderActions">
+        <button class="modal-send-btn" id="sendRecipeBtn"><i class="fas fa-paper-plane"></i></button>
+        <button class="modal-copy-btn" id="copyRecipeSyntaxBtn"><i class="fas fa-copy"></i></button>
+      </div>
+    `;
+    global.fetch = vi.fn();
+  });
+
+  afterEach(() => {
+    document.body.innerHTML = '';
+    delete global.fetch;
+  });
+
+  it('copies the recipe syntax when the header copy button is clicked', async () => {
+    const recipeModal = await createRecipeModal();
+    recipeModal.recipeId = 'recipe-1';
+    global.fetch.mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({ success: true, syntax: '<lora:foo:1>' }),
+    });
+
+    recipeModal.setupCopyButtons();
+    document.getElementById('copyRecipeSyntaxBtn').dispatchEvent(new Event('click', { bubbles: true }));
+    await flushAsyncTasks();
+
+    expect(global.fetch).toHaveBeenCalledWith('/api/lm/recipe/recipe-1/syntax');
+    expect(copyToClipboardMock).toHaveBeenCalledWith('<lora:foo:1>', 'Recipe syntax copied to clipboard');
+  });
+
+  it('shows an error toast and skips the API call without a recipe ID', async () => {
+    const recipeModal = await createRecipeModal();
+    recipeModal.recipeId = null;
+
+    await recipeModal.fetchAndCopyRecipeSyntax();
+
+    expect(global.fetch).not.toHaveBeenCalled();
+    expect(showToastMock).toHaveBeenCalledWith('toast.recipes.noRecipeId', {}, 'error');
+  });
+
+  it('shows an error toast when the backend returns no syntax', async () => {
+    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+    const recipeModal = await createRecipeModal();
+    recipeModal.recipeId = 'recipe-1';
+    global.fetch.mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({ success: false, error: 'no syntax' }),
+    });
+
+    await recipeModal.fetchAndCopyRecipeSyntax();
+
+    expect(copyToClipboardMock).not.toHaveBeenCalled();
+    expect(showToastMock).toHaveBeenCalledWith(
+      'toast.recipes.copyFailed',
+      { message: 'no syntax' },
+      'error'
+    );
+    errorSpy.mockRestore();
+  });
+});

tests/frontend/components/recipeModal.navigation.test.js

@@ -110,6 +110,7 @@ function recipeModalFixture() {
           </div>
           <div class="recipe-header-actions" id="recipeHeaderActions">
             <button class="modal-send-btn" id="sendRecipeBtn"><i class="fas fa-paper-plane"></i></button>
+            <button class="modal-copy-btn" id="copyRecipeSyntaxBtn"><i class="fas fa-copy"></i></button>
           </div>
           <div id="recipeTagsContainer"></div>
         </header>