fix(design): distinguish saved video settings from preparation needs

tests/e2e/image-workspace-v2.spec.ts

@@ -123,7 +123,7 @@ test.describe('AI Design V2 workspace', () => {
                   preserve_instructions: [],
                   change_instructions: [],
                 },
-                video: { shots: [] },
+                video: { shots: [], total_duration_seconds: null as number | null },
                 output: {
                   aspect_ratio: '3:4',
                   orientation: 'portrait',
@@ -186,11 +186,19 @@ test.describe('AI Design V2 workspace', () => {
           __designE2eAuthReady?: boolean;
           __designE2eProfileReady?: boolean;
           __designE2eCompleteTask?: () => void;
+          __designE2eOpenIncompleteVideo?: () => void;
           __designE2eDownloadCount?: number;
         };
         e2eGlobal.__designE2eAuthReady = false;
         e2eGlobal.__designE2eProfileReady = false;
         e2eGlobal.__designE2eDownloadCount = 0;
+        e2eGlobal.__designE2eOpenIncompleteVideo = () => {
+          workspace.form.specification.values.intent.media = 'video';
+          workspace.form.specification.values.video.total_duration_seconds = null;
+          workspace.form.directionRevision += 1;
+          workspace.form.specificationRevision += 1;
+          workspace.workspace.specificationRevision = workspace.form.specificationRevision;
+        };
         e2eGlobal.__designE2eCompleteTask = () => {
           workspace.tasks[0] = {
             ...workspace.tasks[0],
@@ -303,6 +311,9 @@ test.describe('AI Design V2 workspace', () => {
                   if (operation.kind === 'set' && operation.path === 'output.orientation') {
                     workspace.form.specification.values.output.orientation = String(operation.value ?? '');
                   }
+                  if (operation.kind === 'set' && operation.path === 'video.total_duration_seconds') {
+                    workspace.form.specification.values.video.total_duration_seconds = Number(operation.value);
+                  }
                 }
               }
               if (command.input?.kind === 'chat' && command.input.message) {
@@ -589,6 +600,20 @@ test.describe('AI Design V2 workspace', () => {
       expect(await app.evaluate(() => (
         globalThis as typeof globalThis & { __designE2eDownloadCount?: number }
       ).__designE2eDownloadCount)).toBe(0);
+      await app.evaluate(() => {
+        (globalThis as typeof globalThis & { __designE2eOpenIncompleteVideo?: () => void })
+          .__designE2eOpenIncompleteVideo?.();
+      });
+      await page.reload();
+      const duration = page.getByRole('combobox', { name: '时长' });
+      await expect(duration).toHaveValue('');
+      await expect(page.getByRole('button', { name: '增加时长' })).toHaveCount(0);
+      await expect(page.getByText('至少写一个视频画面。')).toHaveCount(0);
+      await duration.selectOption('6');
+      await expect(page.getByRole('button', { name: '增加时长' })).toBeEnabled();
+      await page.reload();
+      await expect(page.getByRole('combobox', { name: '时长' })).toHaveCount(0);
+      await expect(page.getByText('6 秒', { exact: true })).toBeVisible();
     } finally {
       await closeElectronApp(app);
     }

tests/unit/youth-creation-card.test.tsx

@@ -3,7 +3,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest';
 import { DesignPlanHistory } from '@/pages/ImageCanvas/DesignPlanHistory';
 import { YouthCreationCard } from '@/pages/ImageCanvas/YouthCreationCard';
 import { useImageWorkspaceStore } from '@/stores/image-workspace';
-import type { DesignGenerationTask } from '../../shared/image-workspace';
+import type { DesignCompilationIssue, DesignGenerationTask } from '../../shared/image-workspace';
 import {
   designCapabilitiesFixture,
   designFormFixture,
@@ -58,7 +58,7 @@ function taskFixture(overrides: Partial<DesignGenerationTask> = {}): DesignGener
   };
 }
 
-function renderCard(workspace = designWorkspaceFixture()) {
+function renderCard(workspace = designWorkspaceFixture(), quoteBlockers: DesignCompilationIssue[] = []) {
   const actions = {
     applyFieldOperations: vi.fn().mockResolvedValue(workspace),
     prepareGeneration: vi.fn().mockResolvedValue(workspace),
@@ -74,7 +74,7 @@ function renderCard(workspace = designWorkspaceFixture()) {
   render(
     <YouthCreationCard
       workspace={workspace}
-      quoteBlockers={[]}
+      quoteBlockers={quoteBlockers}
       generationAvailable
       generationOptions={designCapabilitiesFixture.generationOptions}
       onQuoteOffered={vi.fn()}
@@ -123,6 +123,49 @@ describe('YouthCreationCard', () => {
     useImageWorkspaceStore.getState().reset();
   });
 
+  it('does not present a missing saved video duration as an already selected six seconds', () => {
+    const workspace = referenceWorkspace();
+    workspace.form.specification.values.intent.media = 'video';
+    workspace.form.specification.values.video.first_frame_asset_id = 'asset-reference';
+    workspace.form.specification.values.references[0].role = 'first_frame';
+    renderCard(workspace, [
+      { code: 'video_duration_required', message: 'required', severity: 'blocker', path: 'video.total_duration_seconds' },
+      { code: 'video_shots_required', message: 'required', severity: 'blocker', path: 'video.shots' },
+    ]);
+    expect(screen.getByRole('combobox', { name: '时长' })).toHaveValue('');
+    expect(screen.getByRole('button', { name: '准备制作方案' })).toBeDisabled();
+    expect(screen.queryByRole('button', { name: '增加时长' })).not.toBeInTheDocument();
+    expect(screen.queryByText('至少写一个视频画面。')).not.toBeInTheDocument();
+  });
+
+  it('allows AI preparation without requiring the user to write internal video shots', async () => {
+    const workspace = referenceWorkspace();
+    workspace.form.specification.values.intent.media = 'video';
+    workspace.form.specification.values.video.first_frame_asset_id = 'asset-reference';
+    workspace.form.specification.values.references[0].role = 'first_frame';
+    workspace.form.specification.values.video.total_duration_seconds = 6;
+    const actions = renderCard(workspace, [
+      { code: 'video_shots_required', message: 'required', severity: 'blocker', path: 'video.shots' },
+    ]);
+    expect(screen.getByText('6 秒')).toBeInTheDocument();
+    expect(screen.queryByText('至少写一个视频画面。')).not.toBeInTheDocument();
+    expect(screen.getByRole('button', { name: '准备制作方案' })).toBeEnabled();
+    fireEvent.click(screen.getByRole('button', { name: '准备制作方案' }));
+    await waitFor(() => expect(actions.requestQuote).toHaveBeenCalledOnce());
+  });
+
+  it('restores the saved duration after a failed parameter edit', async () => {
+    const workspace = referenceWorkspace();
+    workspace.form.specification.values.intent.media = 'video';
+    workspace.form.specification.values.video.total_duration_seconds = 6;
+    const actions = renderCard(workspace);
+    actions.applyFieldOperations.mockRejectedValueOnce(new Error('save failed'));
+    fireEvent.click(screen.getByRole('button', { name: '增加时长' }));
+    await waitFor(() => expect(screen.getByText('方案需要重试')).toBeInTheDocument());
+    expect(screen.getByText('6 秒')).toBeInTheDocument();
+    expect(screen.queryByText('7 秒')).not.toBeInTheDocument();
+  });
+
   it('persists the displayed supported duration when entering video mode', async () => {
     const actions = renderCard();
     fireEvent.change(screen.getByRole('combobox', { name: '类型' }), { target: { value: 'video' } });