General maintenance: KDE.KritaShellExtension version 1.2.4

[DandelionSprout]

📖 Description

• Tags:
• • Replaced thumbnail with kra-thumbnails to distinguish it from dedicated image/video/E-book/3D-model thumbnail apps.
• • Added tags related to Windows File Explorer.
• Added ReleaseDate.
• Upgraded ManifestVersion from 1.1.0 to 1.12.0.
• Filesize-reducing measures.

✅ Checklist

• Signed the Contributor License Agreement
• Linked to an issue (if applicable)
  • Resolves #[Issue Number]

📦 Manifest Checklist

• Checked that there aren't other open pull requests for the same manifest update/change
• This PR only modifies one (1) manifest
• Validated manifest locally with winget validate --manifest <path> (validation guide)
• Tested manifest locally with winget install --manifest <path>
• Manifest conforms to the 1.12 schema

Note: <path> is the directory containing the manifest you're submitting.

Microsoft Reviewers: Open in CodeFlow

[wingetbot]

Validation Pipeline Run WinGetSvc-Validation-142-375503-20260516-1

[wingetbot]

Publish pipeline succeeded for this Pull Request. Once you refresh your index, this change should be present.