Fix CI JS corruption from obfuscator stdout; clean up flaky test guards

- Strip [javascript-obfuscator-cli] progress line from elc --obfuscate
  output before writing to dist/js/ (was prepended to every compiled JS
  file, causing browser parse errors on stage)
- Remove spurious waitForFunction(signUpWithEmail) guards from
  buyer-name and buyer-email structural tests (pure DOM tests, no auth)
- Switch chat.spec.ts beforeEach to domcontentloaded (SSR elements
  present at DOM ready; networkidle caused cold-start timeouts)

.gitea/workflows/stage.yaml

@@ -207,10 +207,11 @@ jobs:
             [ -f "$f" ] || continue
             name=$(basename "$f" .el)
             echo "Compiling $f..."
-            "$ELC" --target=js --bundle --minify --obfuscate "$f" > "dist/js/${name}.js" || {
+            "$ELC" --target=js --bundle --minify --obfuscate "$f" > /tmp/_elc_out.js || {
               echo "elc FAILED on $f"
               exit 1
             }
+            sed '/^\[javascript-obfuscator/d' /tmp/_elc_out.js > "dist/js/${name}.js"
             echo "  compiled: $f -> dist/js/${name}.js"
           done
           rm -f src/js/el_runtime.js