rosenthal: Add bb-auth.

* modules/rosenthal/packages/patches/bb-auth.patch: New file.
* modules/rosenthal/packages/authentication.scm (bb-auth): New variable.

modules/rosenthal/packages/authentication.scm

@@ -0,0 +1,64 @@
+;;; SPDX-License-Identifier: GPL-3.0-or-later
+;;; Copyright © 2026 Hilton Chain <hako@ultrarare.space>
+
+(define-module (rosenthal packages authentication)
+  ;; Utilities
+  #:use-module (guix gexp)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix packages)
+  #:use-module (guix utils)
+  #:use-module (rosenthal utils packages)
+  ;; Guix origin methods
+  #:use-module (guix git-download)
+  ;; Guix build systems
+  #:use-module (guix build-system qt)
+  ;; Guix packages
+  #:use-module (gnu packages gnome)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages polkit)
+  #:use-module (gnu packages qt))
+
+(define-public bb-auth
+  (package
+    (name "bb-auth")
+    (version "0.2.0")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                     (url "https://github.com/anthonyhab/bb-auth")
+                     (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1jx526h7qw7mw4cp2c8ys4ck1qlc5v9qf51zvj951l4kqbrs0w44"))
+              (patches (rosenthal-patches "bb-auth.patch"))))
+    (build-system qt-build-system)
+    (arguments
+     (list #:qtbase qtbase
+           #:phases
+           #~(modify-phases %standard-phases
+               (add-after 'unpack 'patch-test-references
+                 (lambda _
+                   (substitute* (find-files "tests")
+                     (("/bin/(true|false)" _ cmd)
+                      (which cmd)))))
+               (add-after 'qt-wrap 'patch-script
+                 (lambda _
+                   (with-directory-excursion (in-vicinity #$output "libexec")
+                     (substitute* "pinentry-bb"
+                       (("libexec/bb-auth\"" all)
+                        (string-append all " \"--pinentry\"")))
+                     (substitute* "bb-keyring-prompter"
+                       (("libexec/bb-auth\"" all)
+                        (string-append all " \"--keyring\"")))))))))
+    (native-inputs
+     (list pkg-config))
+    (inputs
+     (list gcr
+           json-glib-minimal
+           polkit
+           polkit-qt6))
+    (home-page "https://github.com/anthonyhab/bb-auth")
+    (synopsis "Unified polkit, keyring, and pinentry authentication daemon")
+    (description "")
+    (license license:bsd-3)))

modules/rosenthal/packages/patches/bb-auth.patch

@@ -0,0 +1,20 @@
+diff --git a/src/main.cpp b/src/main.cpp
+index 18898d7..6426354 100644
+--- a/src/main.cpp
++++ b/src/main.cpp
+@@ -49,6 +49,7 @@ namespace {
+         QCommandLineOption optDaemon(QStringList{"daemon", "d"}, "Run as daemon (polkit agent + IPC server).");
+         QCommandLineOption optKeyring(QStringList{"keyring"}, "Run as keyring prompter (GCR replacement).");
+         QCommandLineOption optPinentry(QStringList{"pinentry"}, "Run as GPG pinentry.");
++        QCommandLineOption optDisplay(QStringList{"display"}, "");
+ 
+         // CLI options (for interacting with running daemon)
+         QCommandLineOption optPing(QStringList{"ping"}, "Check if the daemon is reachable.");
+@@ -60,6 +61,7 @@ namespace {
+         parser.addOption(optDaemon);
+         parser.addOption(optKeyring);
+         parser.addOption(optPinentry);
++        parser.addOption(optDisplay);
+         parser.addOption(optPing);
+         parser.addOption(optNext);
+         parser.addOption(optRespond);