fix: use Playwright's bundled FFmpeg when system ffmpeg not on PATH

[DeDuckProject]

In CI (GitHub Actions), playwright install chromium --with-deps downloads its own FFmpeg binary to the ms-playwright cache directory, but it is not added to the system PATH. The bare ffmpeg command in post-processor.ts therefore fails, causing the pipeline to fall back to screenshots instead of producing a GIF.

resolveFfmpegPath() now tries system ffmpeg first, then scans the Playwright cache directory (~/.cache/ms-playwright on Linux, etc.) for the bundled binary. Works on Linux, macOS, and Windows without any changes to the CI workflow.

[github-actions]

🎬 UI Demo Preview

Changes detected in: .github/workflows/ci.yml, .github/workflows/demo.yml, examples/simple-app/server.js, packages/action/dist/index.js, packages/action/dist/index.js.map (+2 more)

What changed: The product page UI has been enhanced with a 'Best Seller' badge, a formatted price display ($129.99), an updated cart counter showing 'X in cart', and a new Wishlist button that toggles to '♥ Wishlisted' and shows a confirmation message when clicked.

Demo script (auto-generated)

import type { Page } from '@playwright/test';

export async function demo(page: Page): Promise<void> {
  await page.goto('http://localhost:3000');
  await page.waitForLoadState('networkidle');
  await page.waitForTimeout(1500);

  // Highlight the 'Best Seller' badge
  const badge = page.locator('.badge');
  await badge.scrollIntoViewIfNeeded();
  await page.waitForTimeout(1500);

  // Highlight the price
  const price = page.locator('.price');
  await price.scrollIntoViewIfNeeded();
  await page.waitForTimeout(1500);

  // Click 'Add to Cart' first time
  await page.getByRole('button', { name: 'Add to Cart' }).click();
  await page.waitForTimeout(1000);

  // Click 'Add to Cart' second time
  await page.getByRole('button', { name: 'Add to Cart' }).click();
  await page.waitForTimeout(1500);

  // Show the counter now reads '2 in cart'
  const counter = page.locator('#counter');
  await counter.scrollIntoViewIfNeeded();
  await page.waitForTimeout(1500);

  // Click the Wishlist button
  await page.getByRole('button', { name: '♡ Wishlist' }).click();
  await page.waitForTimeout(1500);

  // Show the 'Added to wishlist!' confirmation message
  const wishlistMsg = page.locator('#wishlist-msg');
  await wishlistMsg.scrollIntoViewIfNeeded();
  await page.waitForTimeout(2000);
}

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