Refactor: Migrate deprecated Ansible facts to ansible_facts[] syntax

Why:
- Ansible 2.20+ deprecates INJECT_FACTS_AS_VARS and direct usage of top-level ansible_* facts.
- This change updates all affected roles and vars files to the new supported syntax.
- Ensures compatibility with upcoming Ansible 2.24 removal of implicit fact injection.

Conversation reference:
https://chatgpt.com/share/692f639b-1380-800f-9f18-732f7108e9e2

roles/desk-chromium/tasks/main.yml

@@ -2,7 +2,7 @@
 - name: Update package cache (Debian/Ubuntu)
   apt:
     update_cache: yes
-  when: ansible_os_family == "Debian"
+  when: ansible_facts['os_family'] == "Debian"
 
 - name: Install Chromium browser
   package:

roles/desk-chromium/vars/main.yml

@@ -2,4 +2,4 @@
 
 application_id:   "desk-chromium"
 
-chromium_package: "{{ 'chromium-browser' if ansible_os_family == 'Debian' else 'chromium' }}"
+chromium_package: "{{ 'chromium-browser' if ansible_facts['os_family'] == 'Debian' else 'chromium' }}"