refactor(runbackup): move screen CSS into the Web Asset Manager
All full-screen backup CSS now loads through Joomla WAM instead of an
inline <style> block (and the redundant inline style="width:0"):
- New media/css/runbackup.css holds the whole stylesheet.
- Registered as asset com_mokosuitebackup.runbackup in joomla.asset.json.
- tmpl/runbackup/default.php loads it via
getDocument()->getWebAssetManager()->useStyle(com_mokosuitebackup.runbackup),
matching the existing com_mokosuitebackup.admin pattern.
The css folder already ships via the manifest <folder>css</folder>, so no
manifest change is needed.
Claude-Session: https://claude.ai/code/session_01WbGBN9VyRK61zczYWcCQ2i
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