Review of 1.0.3: names a snapshot cannot hold, restore-directory errors under salvage, browse speed

- Leave out and report a file or folder whose name a snapshot cannot hold
- A staging write failure stops a full restore under --salvage
- Browse reuses its repository; empty folders read along with the entries
- Keep leases alive while empty folders are created; exact-prefix empty folder is the target
- Clean up tables that were partly created or before the transaction started
- Bin: no empty message after a read error; longer pages

lib/Service/RestoreFullService.php

@@ -209,6 +209,8 @@ final class RestoreFullService {
 			try {
 				/** @var array<string, mixed> $backupConfig */
 				$backupConfig = $this->fetchBackupConfig($target, $snapshotId, $salvage);
+			} catch (\OCA\NgBackup\Repository\RestoreTargetException $e) {
+				throw $e; // nowhere to put it: not a config.php that cannot be read
 			} catch (\Throwable $e) {
 				if (!$salvage) {
 					throw $e;