refact(oidc): manually open the browser (#15706)

* refact(oidc): manually open the browser

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): allow copying OIDC authentication links

Signed-off-by: fufesou <linlong1266@gmail.com>

* Remove unused translation in ko.rs

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): better hint on browser didn't open

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): login handle exception

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): remove unused translations

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): login handle error

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): login in flight

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(translation): move "Continue" to the end of template.rs

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): var rename

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): remove useless "open sign-in page"

Signed-off-by: fufesou <linlong1266@gmail.com>

* Remove unecessary translation contents

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): better way to show&expand the url

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact(oidc): better login ui

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix(oidc): discard stale auth results after cancellation

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix(oidc): handle auth status query failures safely

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix(oidc): prevent concurrent login operations

- reuse the active login dialog and block duplicate password submissions
- cancel only active OIDC operations when closing the dialog
- preserve authentication state until failure cancellation succeeds

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix(oidc): refine login options error feedback

Preserve typed errors to hide the network tip for
HTTP failures and clarify the login-options API contract.

Signed-off-by: fufesou <linlong1266@gmail.com>

---------

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/models/user_model.dart

@@ -234,8 +234,9 @@ class UserModel {
     return loginResponse;
   }
 
-  /// Throws on network failure so callers can surface the error and offer a
-  /// retry; returns an empty list when the server has no third-party login.
+  /// Throws on network failures, non-success responses, and invalid response
+  /// data. Returns an empty list when no API server is configured or a
+  /// successful response contains no third-party login options.
   static Future<List<dynamic>> queryOidcLoginOptions() async {
     final url = await bind.mainGetApiServer();
     if (url.trim().isEmpty) return [];