refactor: Modernize switch; use switch-expressions and no break;

[spydon]

Description

Replaces the switch cases that can be replaces with switch expressions and removes break; where it isn't needed.

https://dart.dev/language/branches#switch-statements

Checklist

• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• No, this PR is not a breaking change.

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