fix: UI world map

src/lib/timeline/detail/PhotoEditor.svelte

@@ -7,18 +7,23 @@
 
   let fileInput;
   let uploading = $state(false);
+  let uploadError = $state('');
 
   function remove(index) {
     onchange(photos.filter((_, i) => i !== index));
+    uploadError = '';
   }
 
   async function addFiles(e) {
     const files = Array.from(e.currentTarget.files ?? []);
     if (!files.length) return;
     uploading = true;
+    uploadError = '';
     try {
       const urls = await Promise.all(files.map(uploadPhoto));
       onchange([...photos, ...urls]);
+    } catch (err) {
+      uploadError = err?.message ?? 'Upload failed. Check Firebase Storage rules.';
     } finally {
       uploading = false;
       e.currentTarget.value = '';
@@ -68,6 +73,10 @@
       </button>
     </div>
   {/if}
+
+  {#if uploadError}
+    <div class="upload-error">{uploadError}</div>
+  {/if}
 </div>
 
 <style>
@@ -183,4 +192,15 @@
     transition: border-color 0.15s, color 0.15s;
   }
   .add-cell:hover { border-color: var(--accent-border); color: var(--accent); }
+
+  .upload-error {
+    font-size: 12px;
+    color: #ef4444;
+    background: #fef2f2;
+    border: 1px solid #fecaca;
+    border-radius: 6px;
+    padding: 8px 10px;
+    line-height: 1.4;
+    word-break: break-word;
+  }
 </style>