feat: Implement Media Matching Workflow

- Added matching wizard to MediaManager.html for linking Drive files to orphaned Shopify media on load.
- Updated MediaService.ts to extract filenames from Shopify URLs for better matching.
- Added linkDriveFileToShopifyMedia method to MediaService and exposed it via mediaHandlers and global.ts.
- Improved UX in MediaManager with image transition clearing and button state feedback.

src/mediaHandlers.ts

@@ -116,6 +116,17 @@ export function getMediaDiagnostics(sku: string) {
   }
 }
 
+export function linkDriveFileToShopifyMedia(sku: string, driveId: string, shopifyId: string) {
+  const config = new Config()
+  const driveService = new GASDriveService()
+  const shop = new Shop()
+  const shopifyMediaService = new ShopifyMediaService(shop)
+  const networkService = new GASNetworkService()
+  const mediaService = new MediaService(driveService, shopifyMediaService, networkService, config)
+
+  return mediaService.linkDriveFileToShopifyMedia(sku, driveId, shopifyId)
+}
+
 export function saveFileToDrive(sku: string, filename: string, mimeType: string, base64Data: string) {
   const config = new Config()
   const driveService = new GASDriveService()