test(tiktok): cover MediaItem dimensions and platform max-width helpers

Direct unit tests for the new MediaItem::width()/height() accessors and
MediaOptimizer::maxWidthForPlatform(), plus drop a redundant inline comment.

app/Services/Social/TikTokPublisher.php

@@ -276,9 +276,6 @@ private function publishPhotos(PostPlatform $postPlatform, $mediaCollection, ?st
                 'url' => $this->buildTikTokUrl($postPlatform->socialAccount, $postId),
             ];
         } finally {
-            // TikTok pulls the images during the synchronous status poll above,
-            // so by the time we reach here the fetch is finished and the
-            // temporary derivatives can be safely removed.
             if ($derivatives !== []) {
                 Storage::delete($derivatives);
             }

tests/Unit/DataTransferObjects/MediaItemTest.php

@@ -34,3 +34,43 @@
 
     expect($item->isImage())->toBeTrue();
 });
+
+test('fromArray reads pixel dimensions from the meta block', function () {
+    $item = MediaItem::fromArray([
+        'path' => 'photo.jpg',
+        'url' => 'https://x/photo.jpg',
+        'meta' => ['width' => 1254, 'height' => 836],
+    ]);
+
+    expect($item->width())->toBe(1254)
+        ->and($item->height())->toBe(836);
+});
+
+test('width and height are null when no meta is present', function () {
+    $item = MediaItem::fromArray(['path' => 'photo.jpg', 'url' => 'https://x/photo.jpg']);
+
+    expect($item->width())->toBeNull()
+        ->and($item->height())->toBeNull();
+});
+
+test('width and height ignore non-numeric meta values', function () {
+    $item = MediaItem::fromArray([
+        'path' => 'photo.jpg',
+        'url' => 'https://x/photo.jpg',
+        'meta' => ['width' => 'wide', 'height' => null],
+    ]);
+
+    expect($item->width())->toBeNull()
+        ->and($item->height())->toBeNull();
+});
+
+test('numeric string dimensions are coerced to integers', function () {
+    $item = MediaItem::fromArray([
+        'path' => 'photo.jpg',
+        'url' => 'https://x/photo.jpg',
+        'meta' => ['width' => '1080', 'height' => '1920'],
+    ]);
+
+    expect($item->width())->toBe(1080)
+        ->and($item->height())->toBe(1920);
+});

tests/Unit/Services/Media/MediaOptimizerTest.php

@@ -111,6 +111,22 @@ function createTestImage(int $width, int $height, string $format = 'image/jpeg')
     expect($optimized->width())->toBeLessThanOrEqual(1000);
 });
 
+it('exposes the configured max width per platform', function () {
+    $optimizer = new MediaOptimizer;
+
+    expect($optimizer->maxWidthForPlatform(Platform::TikTok))->toBe(1080)
+        ->and($optimizer->maxWidthForPlatform(Platform::Instagram))->toBe(1440)
+        ->and($optimizer->maxWidthForPlatform(Platform::Pinterest))->toBe(1000);
+});
+
+it('reports a max width for every platform', function () {
+    $optimizer = new MediaOptimizer;
+
+    foreach (Platform::cases() as $platform) {
+        expect($optimizer->maxWidthForPlatform($platform))->toBeInt()->toBeGreaterThan(0);
+    }
+});
+
 it('handles all platforms without error', function () use (&$tempFiles) {
     $source = createTestImage(1000, 800);
     $tempFiles[] = $source;