Filter student code errors from Sentry and fix async error handling (#8471) (#8492)

Student JS exercise code runs in blob URLs via the bootcamp test runner.
Errors from that code (e.g. expected test failures) were reaching Sentry
as unhandled promise rejections because handleRunCode called the async
runCode() without await, bypassing the existing try-catch error handler.

- Add Sentry beforeSend filter to drop errors from blob: URL stack frames
- Await runCode() in handleRunCode so the existing error UI works
- Remove stale commented-out try-catch and debug console.log

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: iHiD

app/javascript/components/bootcamp/JikiscriptExercisePage/CodeMirror/useEditorHandler.tsx

@@ -91,15 +91,13 @@ export function useEditorHandler({
     }
   }
 
-  const handleRunCode = () => {
+  const handleRunCode = async () => {
     if (editorHandler.current) {
       const value = editorHandler.current.getValue()
 
       setLatestValueSnapshot(value)
       try {
-        //const time = performance.now()
-        runCode(value, editorViewRef.current)
-        //console.log('Duration', performance.now() - time)
+        await runCode(value, editorViewRef.current)
       } catch (e: unknown) {
         if (
           process.env.NODE_ENV === 'development' ||

app/javascript/components/bootcamp/JikiscriptExercisePage/hooks/useConstructRunCode/useConstructRunCode.ts

@@ -125,7 +125,6 @@ export function useConstructRunCode({
           }
         }
       )
-      // try {
       testResults = await generateAndRunTestSuite(
         {
           studentCode,
@@ -143,20 +142,6 @@ export function useConstructRunCode({
         editorView,
         language
       )
-      // console.log("Thinks I've run", testResults.tests.length)
-      // } catch (error) {
-      //   console.log(error)
-      //   const compError = error as CompilationError
-      //   if (
-      //     compError.hasOwnProperty('type') &&
-      //     compError.type == 'CompilationError'
-      //   ) {
-      //     handleCompilationError(compError.error, editorView)
-      //     return
-      //   }
-      //   console.log(compError)
-      // }
-      console.log('No error')
 
       const bonusTestResults = await generateAndRunTestSuite(
         {

app/javascript/utils/react-bootloader.tsx

@@ -115,6 +115,16 @@ if (process.env.SENTRY_DSN) {
       )
       if (isNonErrorRejection) return null
 
+      // Drop errors from student code running in blob URLs (bootcamp JS
+      // exercises execute student solutions via dynamically created blob:
+      // modules — errors from those are expected, not application bugs)
+      const isStudentCodeError = event.exception?.values?.some((ex) =>
+        ex.stacktrace?.frames?.some((frame) =>
+          frame.filename?.startsWith('blob:')
+        )
+      )
+      if (isStudentCodeError) return null
+
       const tag = document.querySelector<HTMLMetaElement>(
         'meta[name="user-id"]'
       )