fix(upload-model): UI/UX improvements for Upload Model Dialog (#7969)

## Summary

Addresses UI/UX feedback on the Upload Model Dialog (BYOM feature).

## Changes

1. **Standardize link styling** - Use consistent `text-muted-foreground
underline` for all links in both URL input variants
2. **Increase warning/example text font size** - Changed from 12px
(`text-xs`) to 14px (`text-sm`) for better readability
3. **Fix padding inconsistency** - Aligned padding between model name
box and SingleSelect dropdown; moved "Not sure?" help text inline with
the label
4. **Add "Upload Another" button** - Allows users to upload multiple
models without closing and reopening the dialog

## Testing

- Verified link styling consistency across both Civitai and generic URL
input components
- Confirmed padding alignment in confirmation step
- Tested Upload Another button resets wizard to step 1

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7969-fix-upload-model-UI-UX-improvements-for-Upload-Model-Dialog-2e66d73d3650815c8184cedb3d02672d)
by [Unito](https://www.unito.io)

src/platform/assets/components/UploadModelConfirmation.vue

@@ -5,7 +5,7 @@
         {{ $t('assetBrowser.modelAssociatedWithLink') }}
       </p>
       <div
-        class="flex items-center gap-3 rounded-lg bg-secondary-background p-3"
+        class="flex items-center gap-3 rounded-lg bg-secondary-background px-4 py-2"
       >
         <img
           v-if="previewImage"
@@ -21,9 +21,15 @@
 
     <!-- Model Type Selection -->
     <div class="flex flex-col gap-2">
-      <label class="">
-        {{ $t('assetBrowser.modelTypeSelectorLabel') }}
-      </label>
+      <div class="flex items-center gap-2">
+        <label>
+          {{ $t('assetBrowser.modelTypeSelectorLabel') }}
+        </label>
+        <i class="icon-[lucide--circle-question-mark] text-muted-foreground" />
+        <span class="text-muted-foreground">
+          {{ $t('assetBrowser.notSureLeaveAsIs') }}
+        </span>
+      </div>
       <SingleSelect
         v-model="modelValue"
         :label="
@@ -35,10 +41,6 @@
         :disabled="isLoading"
         data-attr="upload-model-step2-type-selector"
       />
-      <div class="flex items-center gap-2">
-        <i class="icon-[lucide--circle-question-mark]" />
-        <span>{{ $t('assetBrowser.notSureLeaveAsIs') }}</span>
-      </div>
     </div>
   </div>
 </template>