[bugfix] Fix double-click required after pasting URL in upload model dialog (#6801)

## Summary
Fixed an issue where users had to click twice to continue after pasting
a URL in the upload model dialog - once to blur the input, then again to
click the button.

## Changes
- **What**: Replaced `UrlInput` with plain `InputText` in
`UploadModelUrlInput` to emit value immediately on input instead of only
on blur
- **Cleanup**: Moved URL cleaning/normalization to the `fetchMetadata`
handler, removed unused `disableValidation` prop from `UrlInput`
component

## Review Focus
- URL normalization logic in `useUploadModelWizard.ts`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6801-bugfix-Fix-double-click-required-after-pasting-URL-in-upload-model-dialog-2b26d73d3650811881aed0cc064efcc7)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/platform/assets/composables/useUploadModelWizard.ts

@@ -62,6 +62,15 @@ export function useUploadModelWizard(modelTypes: Ref<ModelTypeOption[]>) {
   async function fetchMetadata() {
     if (!canFetchMetadata.value) return
 
+    // Clean and normalize URL
+    let cleanedUrl = wizardData.value.url.trim()
+    try {
+      cleanedUrl = new URL(encodeURI(cleanedUrl)).toString()
+    } catch {
+      // If URL parsing fails, just use the trimmed input
+    }
+    wizardData.value.url = cleanedUrl
+
     if (!isCivitaiUrl(wizardData.value.url)) {
       uploadError.value = st(
         'assetBrowser.onlyCivitaiUrlsSupported',