Refactor infra tests, clean E2E step suites, and fix TS in tests

tests/smoke/electron-build.smoke.test.ts

@@ -32,7 +32,7 @@ describe('Electron Build Smoke Tests', () => {
     
     // Split output into lines and check each line
     const lines = buildOutput.split('\n');
-    lines.forEach(line => {
+    lines.forEach((line: string) => {
       if (line.includes('has been externalized for browser compatibility')) {
         foundErrors.push(line.trim());
       }
@@ -84,7 +84,7 @@ describe('Electron Build Smoke Tests', () => {
           const content = fs.readFileSync(fullPath, 'utf-8');
           const lines = content.split('\n');
           
-          lines.forEach((line, index) => {
+          lines.forEach((line: string, index: number) => {
             forbiddenPatterns.forEach(({ pattern, name }) => {
               if (pattern.test(line)) {
                 violations.push({