fix(tests): 5s timeout on the playwright port-picker execSync

A corrupted homebrew python3 (self-referencing exec wrapper) made the
config-load-time free-port helper hang forever, stalling every playwright
run on the machine. With a timeout the existing catch falls back to the
random-port path instead.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/playwright-kicad.config.ts

@@ -52,7 +52,7 @@ function findFreePort(): number {
   try {
     const result = execSync(
       "python3 -c \"import socket; s=socket.socket(); s.bind(('',0)); print(s.getsockname()[1]); s.close()\"",
-      { encoding: "utf-8" }
+      { encoding: "utf-8", timeout: 5000 }
     );
     return parseInt(result.trim());
   } catch {