Studio: polish model load toast styling (#5648)

* fix: toast cancel and style

* fix: align model load toast Cancel and dismiss on the right

* fix: show short cased model name in loaded toast and removed prefix org

* revert: chat load toast refactor to visual-only changes

* fix: align model load toast close button

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Studio: guard empty toast label and dedupe toast padding CSS

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Roland Tannous <rolandtannous@gravityq.ai>
Co-authored-by: Roland Tannous <115670425+rolandtannous@users.noreply.github.com>