fix: use path.basename for cross-platform path inference in transform

Addresses review feedback:
https://github.com/Comfy-Org/ComfyUI_frontend/pull/10694#discussion_r3005550584

tools/test-recorder/src/commands/transform.ts

@@ -1,4 +1,5 @@
 import { readFileSync, writeFileSync } from 'node:fs'
+import { basename } from 'node:path'
 import pc from 'picocolors'
 import { transform, formatTransformSummary } from '../transform/engine'
 import { header } from '../ui/logger'
@@ -26,10 +27,8 @@ export async function runTransform(
   console.log()
 
   // Transform
-  const testName =
-    options.testName ??
-    filePath.split('/').pop()?.replace('.raw.spec.ts', '') ??
-    'test'
+  const inferredName = basename(filePath).replace(/\.raw\.spec\.ts$/, '')
+  const testName = options.testName ?? (inferredName || 'test')
   const tags = options.tags ?? ['@canvas']
   const result = transform(rawCode, { testName, tags })
 
@@ -42,7 +41,15 @@ export async function runTransform(
 
   // Write output
   const outputPath =
-    options.output ?? filePath.replace('.raw.spec.ts', '.spec.ts')
+    options.output ?? filePath.replace(/\.raw\.spec\.ts$/, '.spec.ts')
+  if (!options.output && outputPath === filePath) {
+    console.log(
+      pc.red(
+        '  Refusing to overwrite input file. Pass --output or use a *.raw.spec.ts input.'
+      )
+    )
+    process.exit(1)
+  }
   writeFileSync(outputPath, result.code)
   console.log(pc.green(`  ✅ Saved: ${outputPath}`))
 }