chore: bump version to v2026.4.383 and add screenshot script}
- Bump version from v2026.4.381 to v2026.4.383 in package.json and README.md - Add scripts/screenshots.mjs using Playwright to automate preview image generation - Script captures 12 screenshots across Angular and React UIs (dark, light, matrix themes) - Covers settings, database, console, key view, monitoring, info, and language menu pages - Outputs numbered preview PNGs to redis-ui/artifacts/preview-images directory - Supports configurable base URL via SCREENSHOT_URL environment variable