feat: return confirmation for sent app messages

[davidsteiner]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 93.54839% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.20%. Comparing base (6d6e967) to head (48ec043).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/hotfix/src/session.rs	84.61%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #299      +/-   ##
==========================================
+ Coverage   90.01%   90.20%   +0.19%     
==========================================
  Files          84       84              
  Lines        8330     8394      +64     
==========================================
+ Hits         7498     7572      +74     
+ Misses        832      822      -10     

Flag	Coverage Δ
core	90.05% <93.54%> (+0.20%)	⬆️

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