Fix upload dialog re-trigger + add game size to detail page

- Fixed: navigating back to library no longer re-opens file dialog
  (prev-value guard in uploadTriggered effect)
- Added bundleSize field to Game, populated at load time from .jsdos file
- Game detail page shows file size next to DOS badge (e.g. 'DOS · 127 MB')

frontend/src/pages/GameDetail.svelte

@@ -243,6 +243,13 @@
                 🪟 Requires Windows 3.1 — may not work in browser
               {:else}
                 💾 DOS
+                {#if game.bundle_size}
+                  <span class="size-badge">· {game.bundle_size >= 1073741824
+                    ? (game.bundle_size / 1073741824).toFixed(1) + ' GB'
+                    : game.bundle_size >= 1048576
+                      ? Math.round(game.bundle_size / 1048576) + ' MB'
+                      : Math.round(game.bundle_size / 1024) + ' KB'}</span>
+                {/if}
               {/if}
             </div>
           {/if}
@@ -410,6 +417,10 @@
     background: #1a3a5c;
     color: #6ab0ff;
   }
+  .size-badge {
+    font-weight: 400;
+    opacity: 0.8;
+  }
   .meta { display: flex; gap: 8px; margin-bottom: 8px; }
   .meta-item { background: var(--surface-hover); color: var(--phosphor-dim); padding: 4px 12px; border-radius: 12px; font-size: 0.85rem; }
   .meta-link { cursor: pointer; text-decoration: none; transition: all 0.15s; display: inline-block; }

frontend/src/pages/Library.svelte

@@ -28,9 +28,14 @@
 
   let fileInput;
 
-  // When header upload button is clicked, trigger the hidden file input
+  // When header upload button is clicked, trigger the hidden file input.
+  // Uses a previous-value guard to prevent re-firing on component remount.
+  let prevUploadTrigger = $state(uploadTriggered);
   $effect(() => {
-    if (uploadTriggered > 0) fileInput?.click();
+    if (uploadTriggered > 0 && uploadTriggered !== prevUploadTrigger) {
+      prevUploadTrigger = uploadTriggered;
+      fileInput?.click();
+    }
   });
 
   // Derive filter options from the loaded games