fix: disable become on localhost play and drop deprecated facts

Use now() for export timestamps and ansible_facts['system'] for browser detection. Set become: false on the localhost play to avoid sudo on local fact gathering.

playbook.yml

@@ -9,6 +9,7 @@
   hosts: localhost
   connection: local
   gather_facts: true
+  become: false
   tags: [install, update, export]
   tasks:
     - name: Generate global index.html and open in browser