feat: add headless replay support for recorded Playwright tests

- add replay target to Makefile
- introduce scripts/replay.sh for headless test execution
- document replay workflow in README
- clarify requirements and Arch Linux setup

https://chatgpt.com/share/6984a4ca-1118-800f-88f9-1bd0146e922d

README.md

@@ -37,12 +37,18 @@ Perfect for:
 
 ### 1️⃣ Requirements
 
-* Docker
-* X11 or XWayland (Wayland-only will NOT work)
-* `xhost`
+- Docker
+- X11 or XWayland (Wayland-only will NOT work)
+- `xhost`
 
 On Arch Linux:
 
+```bash
+sudo pacman -S --needed xorg-xhost
+```
+
+---
+
 ## ⚙️ Installation (one-time)
 
 Prepare the recorder script:
@@ -69,6 +75,24 @@ Or with a start URL:
 
 ---
 
+## ▶ Replay recorded tests (headless)
+
+Run all recorded tests:
+
+```bash
+make replay
+```
+
+Run a specific test file:
+
+```bash
+./scripts/replay.sh recordings/login.spec.ts
+```
+
+Replay runs **headless**, without X11, and does **not** require `xhost`.
+
+---
+
 ## 📤 Output
 
 * 📄 Generated test: