[PATCH 0/3] ui: implement OpenID Connect login flow for #4281

[Azharul Haque <haque@azharul.com>]

The native Flutter "Proxmox VE Companion" app never implemented OpenID
Connect / OAuth realm login (bug #4281[0]): selecting an OAuth realm
just showed username/password fields that could never work.

This series adds the login-form side of OIDC support:

  - hide username/password fields for OpenID realms and drive the
    OAuth flow via flutter_web_auth_2 (system browser /
    ASWebAuthenticationSession on iOS, Chrome Custom Tabs on
    Android -- deliberately not an in-app webview)
  - fix a stale Continue button enabled/disabled state when switching
    realms mid-flow
  - namespace the OpenID redirect scheme under Proxmox's own reserved
    com.proxmox.* package prefix, to avoid custom-URL-scheme
    collisions with other apps on Android

Depends on the `type` property added to PveAccessDomainModel in the
companion proxmox_dart_api_client series. A further companion series
to pve_flutter_frontend registers the Android-side callback activity
for the scheme used here; no iOS-side wiring is required, since
ASWebAuthenticationSession resolves the custom-scheme redirect at
runtime without a static declaration.

Verified end-to-end against a real PVE server with an Authentik OIDC
realm, on both Android and iOS.

[0] https://bugzilla.proxmox.com/show_bug.cgi?id=4281

Azharul Haque (3):
  fix #4281: ui: add OpenID Connect login flow to login form
  fix #4281: ui: fix stale Continue button state on realm switch
  fix #4281: ui: use a namespaced OpenID callback scheme

 lib/proxmox_login_form.dart | 451 ++++++++++++++++++++++++------------
 pubspec.lock                | 160 +++++++++++--
 pubspec.yaml                |   1 +
 3 files changed, 441 insertions(+), 171 deletions(-)

-- 
2.50.1 (Apple Git-155)