Improve Flatpak Yaru theme integration

ansible/roles/profile_desktop_i3/tasks/main.yml

@@ -273,6 +273,42 @@
     method: system
   when: (desktop_flatpak_packages | default([])) | length > 0
 
+- name: Gather Flatpak runtime branches for extensions
+  ansible.builtin.shell: >-
+    flatpak list --runtime --columns=application,branch --system
+    | awk '$1 == "org.gnome.Platform" || $1 == "org.freedesktop.Platform" { print $2 }'
+    | sort -u
+  register: desktop_flatpak_runtime_branches
+  changed_when: false
+  when:
+    - (desktop_flatpak_packages | default([])) | length > 0
+    - (desktop_flatpak_extensions | default([])) | length > 0
+
+- name: Build Flatpak extension refs for active runtimes
+  ansible.builtin.set_fact:
+    desktop_flatpak_extension_refs: >-
+      {{
+        (desktop_flatpak_extensions | default([]))
+        | product(desktop_flatpak_runtime_branches.stdout_lines | default([]))
+        | map('join', '//')
+        | list
+      }}
+  when:
+    - (desktop_flatpak_packages | default([])) | length > 0
+    - (desktop_flatpak_extensions | default([])) | length > 0
+
+- name: Install Flatpak extensions for active runtimes
+  community.general.flatpak:
+    name: "{{ item }}"
+    state: present
+    remote: "{{ desktop_flatpak_remote_name | default('flathub') }}"
+    method: system
+  loop: "{{ desktop_flatpak_extension_refs | default([]) }}"
+  when:
+    - (desktop_flatpak_packages | default([])) | length > 0
+    - (desktop_flatpak_extensions | default([])) | length > 0
+    - item | length > 0
+
 - name: Set desktop external tool release metadata
   ansible.builtin.set_fact:
     desktop_tools_tmp_dir: /tmp/desktop-tools