fix(mobile): clear shared link expiry

mobile/lib/pages/library/shared_link/shared_link_edit.page.dart

@@ -369,8 +369,7 @@ class SharedLinkEditPage extends HookConsumerWidget {
       var password = const Optional<String?>.absent();
       var description = const Optional<String?>.absent();
       String? slug;
-      DateTime? expiry;
-      bool? changeExpiry;
+      var expiry = const Optional<DateTime?>.absent();
 
       if (allowDownload.value != existingLink!.allowDownload) {
         download = allowDownload.value;
@@ -404,8 +403,7 @@ class SharedLinkEditPage extends HookConsumerWidget {
 
       final newExpiry = expiryAfter.value;
       if (newExpiry?.toUtc() != existingLink!.expiresAt?.toUtc()) {
-        expiry = newExpiry;
-        changeExpiry = true;
+        expiry = newExpiry == null ? const Optional.present(null) : Optional.present(newExpiry.toUtc());
       }
 
       await ref
@@ -418,8 +416,7 @@ class SharedLinkEditPage extends HookConsumerWidget {
             description: description,
             password: password,
             slug: slug,
-            expiresAt: expiry?.toUtc(),
-            changeExpiry: changeExpiry,
+            expiresAt: expiry,
           );
       if (!context.mounted) {
         return;

mobile/lib/services/shared_link.service.dart

@@ -88,11 +88,10 @@ class SharedLinkService {
     required bool? showMeta,
     required bool? allowDownload,
     required bool? allowUpload,
-    bool? changeExpiry = false,
     Optional<String?> password = const Optional.absent(),
     Optional<String?> description = const Optional.absent(),
     String? slug,
-    DateTime? expiresAt,
+    Optional<DateTime?> expiresAt = const Optional.absent(),
   }) async {
     try {
       final responseDto = await _apiService.sharedLinksApi.updateSharedLink(
@@ -101,11 +100,10 @@ class SharedLinkService {
           showMetadata: showMeta == null ? const Optional.absent() : Optional.present(showMeta),
           allowDownload: allowDownload == null ? const Optional.absent() : Optional.present(allowDownload),
           allowUpload: allowUpload == null ? const Optional.absent() : Optional.present(allowUpload),
-          expiresAt: expiresAt == null ? const Optional.absent() : Optional.present(expiresAt),
           password: password,
           description: description,
+          expiresAt: expiresAt,
           slug: slug == null ? const Optional.absent() : Optional.present(slug),
-          changeExpiryTime: changeExpiry == null ? const Optional.absent() : Optional.present(changeExpiry),
         ),
       );
       if (responseDto != null) {