perf: make domain models and most composables stable

[rushiiMachine]

• Mark all domain models @Immutable
• Pass around immutable lists/maps to composables (fixes majority of lag)

Fixes #97

[X1nto]

Did you test if new messages work?

[rushiiMachine]

no, but thats unrelated to this pr i broke it in stores i think

it should work once the events are properly emitted

[X1nto]

no, but thats unrelated to this pr i broke it in stores i think

it should work once the events are properly emitted

ah okay then

[X1nto]

LGTM