fix(clouddrop): retry share-link during post-processing, never fail upload

Upload completes on server but file is still being processed, so
share-link fails. Retry up to 6x with backoff; on final failure, use
fileId-based fallback URL instead of throwing — prevents upload-manager
from retrying the entire multi-GB upload.

lib/clouddrop-upload.js

@@ -78,10 +78,22 @@ class ClouddropUploader {
       fileId = await this._uploadChunked(filePath, fileName, fileSize, progressCb, signal, throttle);
     }
 
-    // Create a share link for the uploaded file
+    // Create a share link — retry a few times while server post-processes the file.
-    const shareUrl = await this._createShareLink(fileId, signal);
+    // If share-link ultimately fails, DO NOT throw: upload itself succeeded and we
+    // don't want upload-manager to retry the entire (possibly multi-GB) upload.
+    let shareUrl = null;
+    const shareAttempts = 6;
+    for (let i = 0; i < shareAttempts; i++) {
+      if (signal && signal.aborted) throw new Error('Aborted');
+      try {
+        shareUrl = await this._createShareLink(fileId, signal);
+        if (shareUrl) break;
+      } catch (err) {
+        if (i === shareAttempts - 1) break;
+        await new Promise(r => setTimeout(r, 3000 + i * 2000));
+      }
+    }
 
-    // Extract slug from share URL (format: https://clouddrop.cc/share/SLUG)
     const slugMatch = String(shareUrl || '').match(/\/share\/([a-zA-Z0-9]+)/);
     const fileCode = slugMatch ? slugMatch[1] : fileId;