feat: add placeholder content to right panel when no asset selected

src/locales/en/main.json

@@ -2399,6 +2399,7 @@
     },
     "modelInfo": {
       "title": "Model Info",
+      "selectModelPrompt": "Select a model to see its information",
       "basicInfo": "Basic Info",
       "displayName": "Display Name",
       "fileName": "File Name",

src/platform/assets/components/AssetBrowserModal.vue

@@ -68,6 +68,12 @@
 
     <template #rightPanel>
       <ModelInfoPanel v-if="focusedAsset" :asset="focusedAsset" :cache-key />
+      <div
+        v-else
+        class="flex h-full items-center justify-center break-words p-6 text-center text-muted"
+      >
+        {{ $t('assetBrowser.modelInfo.selectModelPrompt') }}
+      </div>
     </template>
   </BaseModalLayout>
 </template>