Replace glob pattern with find command to properly clean dotfiles
in Trash when osascript fallback is used. The old pattern
~/.Trash/* does not match files starting with "." in bash.
This fix ensures that hidden files like .DS_Store, .hidden_file,
etc. are properly removed when cleaning the Trash.
- Replace 48-line custom function with one-line safe_clean call
- Remove unnecessary interactive confirmation (consistent with other browser caches)
- Simplify tests to verify Puppeteer cache is in clean_browsers output
- Net: -93 lines of code for same functionality
The clean_empty_library_items function intentionally skips empty file cleanup
to avoid removing app sentinel files (as noted in lib/clean/user.sh:77).
Updated the test to only verify empty folder cleanup, matching current behavior.
