# Upload Inline Subtitle Style Implementation Plan

> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.

**Goal:** Embed the subtitle defaults controls into the lower-left area of the upload card while preserving the three-card top-row layout for upload, mode, and language.

**Architecture:** Keep the existing upload page behavior and TTS/mode card layout, but remove the standalone subtitle defaults card. Move the preview and sliders into a compact embedded module inside `src/components/UploadScreen.tsx`, and update upload-screen tests to lock in the new structure.

**Tech Stack:** React 19, TypeScript, Tailwind CSS v4 utilities, Vitest, React Testing Library

---

### Task 1: Lock the embedded subtitle module with a failing test

**Files:**
- Modify: `src/components/UploadScreen.test.tsx`
- Reference: `src/components/UploadScreen.tsx`

**Step 1: Write the failing test**

Add a structure test for the new placement:

```tsx
it('renders subtitle defaults inside the upload card footer area', () => {
  renderUploadScreen();

  expect(screen.getByTestId('upload-dropzone-card')).toContainElement(
    screen.getByTestId('upload-subtitle-defaults-panel'),
  );
  expect(screen.queryByTestId('subtitle-defaults-card')).not.toBeInTheDocument();
});
```

**Step 2: Run test to verify it fails**

Run:

```bash
node ./node_modules/vitest/vitest.mjs run src/components/UploadScreen.test.tsx
```

Expected: FAIL because the subtitle defaults controls still render as a standalone card.

**Step 3: Write minimal implementation**

Add the new `data-testid` for the embedded subtitle module and remove the old standalone-card marker.

**Step 4: Run test to verify it passes**

Run:

```bash
node ./node_modules/vitest/vitest.mjs run src/components/UploadScreen.test.tsx
```

Expected: PASS for the new inline-module assertion.

**Step 5: Commit**

```bash
git add src/components/UploadScreen.tsx src/components/UploadScreen.test.tsx
git commit -m "test: lock inline subtitle defaults layout"
```

### Task 2: Move subtitle defaults into the upload card

**Files:**
- Modify: `src/components/UploadScreen.tsx`
- Modify: `src/components/UploadScreen.test.tsx`

**Step 1: Write the failing test**

Add a second focused regression test:

```tsx
it('keeps subtitle preview controls active after moving them into the upload card', () => {
  renderUploadScreen();

  expect(screen.getByTestId('upload-subtitle-defaults-panel')).toContainElement(
    screen.getByTestId('upload-subtitle-preview'),
  );
});
```

**Step 2: Run test to verify it fails**

Run:

```bash
node ./node_modules/vitest/vitest.mjs run src/components/UploadScreen.test.tsx
```

Expected: FAIL until the subtitle module is actually moved.

**Step 3: Write minimal implementation**

Refactor `src/components/UploadScreen.tsx` to:

- delete the standalone subtitle defaults card
- add a compact subtitle defaults module inside the upload card bottom-left region
- keep support text and mode chip in the upload card bottom-right region
- preserve preview and slider behavior exactly

**Step 4: Run test to verify it passes**

Run:

```bash
node ./node_modules/vitest/vitest.mjs run src/components/UploadScreen.test.tsx
```

Expected: PASS for the new structure tests and existing subtitle interaction tests.

**Step 5: Commit**

```bash
git add src/components/UploadScreen.tsx src/components/UploadScreen.test.tsx
git commit -m "feat: embed subtitle defaults in upload card"
```

### Task 3: Full verification

**Files:**
- Modify: `src/components/UploadScreen.tsx`
- Modify: `src/components/UploadScreen.test.tsx`

**Step 1: Write the failing test**

If any final regression appears after the move, add the smallest targeted test first.

**Step 2: Run test to verify it fails**

Run:

```bash
node ./node_modules/vitest/vitest.mjs run src/components/UploadScreen.test.tsx src/App.test.tsx
```

Expected: FAIL only if a real regression remains.

**Step 3: Write minimal implementation**

Apply only the final layout polish needed for the regression.

**Step 4: Run test to verify it passes**

Run:

```bash
npm.cmd test
npm.cmd run lint
npm.cmd run build
```

Expected:

- all tests PASS
- typecheck PASS
- build PASS

**Step 5: Commit**

```bash
git add src/components/UploadScreen.tsx src/components/UploadScreen.test.tsx src/App.tsx src/App.test.tsx
git commit -m "test: verify inline subtitle defaults layout"
```