feat(model manager): 💄 refactor model manager ui

[joshistoast]

Summary

Makes many minor and major UI refactors to the Model Manager.

Changed:

• Less elevated surfaces and unnecessary padding within model panes and lists;
• Adjusted model install tabs, added icons;

Improved:

• Created a reusable component for model result items to display install status;
• Made responsive enhancements to various UI;
• Refactored UI for model result items, clearer separation;
• Created a reusable ModelDeleteButton for use on ModelListItem and in new ModelFooter;
• Slightly improved error handling for model delete logic;

New:

• Added download icons to the model bundle buttons;
• Model Footer with edit, delete and convert buttons;

Related Issues / Discussions

QA Instructions

Merge Plan

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• ❗Changes to a redux slice have a corresponding migration
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)

[psychedelicious]

Nice, looking good!

[open-x-Lab]

The Model Manager should not be integrated as a combined unit. It ought to remain separate and maintain an independent entry point.