[PATCH 3/3] fix #4281: ui: use a namespaced OpenID callback scheme

[Azharul Haque <haque@azharul.com>]

pveauth:// worked in testing, but on Android a custom URL scheme
isn't exclusively owned the way a verified App Link is: any other
app installed on the device could in principle also declare an
intent-filter for the same short, guessable scheme.

Use com.proxmox.app.openid instead, derived from the app's own
package/bundle identifier (com.proxmox.*, reserved for Proxmox on
both app stores), so collisions with another app's scheme are
effectively ruled out rather than merely unlikely.

Signed-off-by: Azharul Haque <haque@azharul.com>
---
 lib/proxmox_login_form.dart | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/proxmox_login_form.dart b/lib/proxmox_login_form.dart
index 002838c..c5ea090 100644
--- a/lib/proxmox_login_form.dart
+++ b/lib/proxmox_login_form.dart
@@ -17,7 +17,11 @@ import 'package:proxmox_login_manager/proxmox_password_store.dart';
 /// OpenID Connect login completes. Must be registered as a valid redirect
 /// URI with the realm's provider, as well as in the platform manifests
 /// (AndroidManifest.xml / Info.plist).
-const String openIdCallbackScheme = 'pveauth';
+///
+/// Derived from the app's own package/bundle identifier (`com.proxmox.*`,
+/// reserved for Proxmox on both app stores) rather than an arbitrary word,
+/// so it can't collide with another app's custom URL scheme.
+const String openIdCallbackScheme = 'com.proxmox.app.openid';
 
 class ProxmoxProgressModel {
   int inProgress = 0;
-- 
2.50.1 (Apple Git-155)