feat: handle fallback prioritize image over slot

src/components/ImageUploadDialog.vue

@@ -64,14 +64,14 @@ function change(e: Event) {
           hidden
         />
         <img
-          :src="imageUrl"
-          v-if="imageUrl"
+          :src="imageUrl || fallbackUrl"
+          v-if="imageUrl || fallbackUrl"
           class="image-container"
           style="object-fit: contain"
-          @error="imageUrl = fallbackUrl || ''"
+          @error="imageUrl = ''"
         />
-        <div class="image-container" v-if="!imageUrl">
-          <slot name="error" v-if="!imageUrl"></slot>
+        <div class="image-container" v-if="!imageUrl && !fallbackUrl">
+          <slot name="error"></slot>
         </div>
         <div style="position: fixed; padding: var(--size-2)">
           <q-btn