fix: resolve compile errors in phase 2 remediation

backend/handlers/files.go

@@ -1290,3 +1290,17 @@ func (h *FSHandler) CheckConflicts(c *fiber.Ctx) error {
 
 	return c.JSON(fiber.Map{"conflicts": conflicts})
 }
+
+// safeRemovePath ensures we never delete a base directory.
+func safeRemovePath(baseDir, targetAbsPath string) error {
+	cleanBase := filepath.Clean(baseDir)
+	cleanTarget := filepath.Clean(targetAbsPath)
+	if cleanTarget == cleanBase || cleanTarget == "." || cleanTarget == "/" {
+		return fmt.Errorf("cannot remove base directory %s", baseDir)
+	}
+	// Ensure it's inside the baseDir
+	if !strings.HasPrefix(cleanTarget, cleanBase+string(os.PathSeparator)) {
+		return fmt.Errorf("path escapes base directory")
+	}
+	return os.RemoveAll(cleanTarget)
+}