[TS Migration] Improve ref types across code base

[mountiny]

Follow up issue for TS migration project. Coming from this spreadsheet

Work on improving ref types across the codebase

cc Could you share more details here please? @blazejkustra @fabioh8010

[blazejkustra]

Hey! I’m Błażej Kustra from Software Mansion, an expert agency, and I’d like to work on this issue!

[mountiny]

Assigned

[jnowakow]

Hey! I'm Jan Nowakowski, I'm also from Software Mansion, and I'll take over this task from Błażej

[melvin-bot]

📣 @jnowakow! 📣
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