ci: switch browser tests to x64 runner for Takumi WASM compat

Author: danielroe

.github/workflows/ci.yml

@@ -131,7 +131,7 @@ jobs:
 
   browser:
     name: 🖥️ Browser tests
-    runs-on: ubuntu-24.04-arm
+    runs-on: ubuntu-latest # Takumi WASM crashes on ARM64 Linux (double free), use x64 until resolved upstream
     container:
       image: mcr.microsoft.com/playwright:v1.58.2-noble