feat: notify application of state changes

[davidsteiner]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.14%. Comparing base (10f9f32) to head (5cfce0f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/hotfix/src/session.rs	80.95%	12 Missing ⚠️
crates/hotfix/src/session/state.rs	72.72%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #326   +/-   ##
=======================================
  Coverage   91.13%   91.14%           
=======================================
  Files          94       94           
  Lines        9218     9249   +31     
=======================================
+ Hits         8401     8430   +29     
- Misses        817      819    +2     

Flag	Coverage Δ
core	91.02% <80.00%> (+<0.01%)	⬆️

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