[PowerRename] Tweak UI and fix performance issues

[stefansjfw]

Summary of the Pull Request

Co-Authored by: @niels9001

What is this about:

1. Tweaking UI according to users feedback:

   • Reduced fontsizes & margins
   • Added the number of items selected (next to the 'Original' header) and items to be renamed (next to the 'Renamed' header)
   • Added gridlines to improve readability.
   • Resizing both Original and Renamed columns on window resize

2. Resolved poor performance issues caused by virtualization and nested ListViews

Previous UI vs. new UI:

Quality Checklist

• Linked issue: New version of PowerRename can't handle large folders anymore #14219 PowerRename - Crashes with lots (900) files all in 3 folder nesting and missing Enumerate feature #14191 [PowerRename] New Fluent UI is less screen space efficient #14164 partialy: The Original File Names are not fully visible if the File Names are long. #14077
• Communication: I've discussed this with core contributors in the issue.
• Tests: Added/updated and all pass
• Installer: Added/updated and all pass
• Localization: All end user facing strings can be localized
• Docs: Added/ updated
• Binaries: Any new files are added to WXS / YML
  • No new binaries
  • YML for signing for new binaries
  • WXS for installer for new binaries

Contributor License Agreement (CLA)

A CLA must be signed. If not, go over here and sign the CLA.

[Dzomlija]

Here is a screenshot of how the Original filename column is cut-off if the filename is exceptionally long:

[jaimecbernardo]

Gave it a try. A folder with >5000 files loaded in what it seemed to be an instant. Definitely fixes the performance issues.

[jaimecbernardo]

LGTM! Implementation looks simpler, as well.
Great work!
Let's get another review here before merging.

[SeraphimaZykova]

Tested, with 5000 it works perfectly.

Also tried a stress test with 60000 files. Of course, it takes time, but at least it opens and shows all of them. Trying to rename or filter them leads to PowerRename crash, but the old version crashed already on start with this amount.