fix(ssh): surface SFTP upload errors (#11640)

tabby-core/src/api/platform.ts

@@ -42,7 +42,7 @@ export abstract class FileTransfer {
     }
 
     isComplete (): boolean {
-        return this.completed || this.completedBytes >= this.getSize()
+        return !this.cancelled && (this.completed || this.completedBytes >= this.getSize())
     }
 
     isCancelled (): boolean {

tabby-ssh/src/session/sftp.ts

@@ -127,6 +127,7 @@ export class SFTPSession {
             await this.rename(tempPath, path)
             transfer.close()
         } catch (e) {
+            transfer.setStatus(e instanceof Error ? e.message : String(e))
             transfer.cancel()
             this.unlink(tempPath).catch(() => null)
             throw e