feat: improve json reading error handling

Author: ashleyhindle

src/Install/Mcp/FileWriter.php

@@ -5,6 +5,7 @@
 namespace Laravel\Boost\Install\Mcp;
 
 use Illuminate\Support\Facades\File;
+use Illuminate\Support\Str;
 
 class FileWriter
 {
@@ -63,7 +64,7 @@ public function save(): bool
     protected function updatePlainJsonFile(string $content): bool
     {
         $config = json_decode($content, true);
-        if ($config === null) {
+        if (json_last_error() !== JSON_ERROR_NONE) {
             return false;
         }
 
@@ -223,16 +224,15 @@ protected function needsCommaBeforeClosingBrace(string $content, int $openBraceP
         $trimmed = preg_replace('/\s+|\/\/.*$/m', '', $innerContent);
 
         // If empty or ends with opening brace, no comma needed
-        if (empty($trimmed) || substr($trimmed, -1) === '{') {
+        if (blank($trimmed) || Str::endsWith($trimmed, '{')) {
             return false;
         }
 
         // If ends with comma, no additional comma needed
-        if (substr($trimmed, -1) === ',') {
+        if (Str::endsWith($trimmed, ',')) {
             return false;
         }
 
-        // Otherwise, we need a comma
         return true;
     }