fix: clear message composer on unmount

[MartinCupela]

🎯 Goal

When any panel that renders message composer unmounts, the composer should be cleared.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.75%. Comparing base (880d12d) to head (129fbb1).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3053   +/-   ##
=======================================
  Coverage   78.75%   78.75%           
=======================================
  Files         426      426           
  Lines       12110    12113    +3     
  Branches     3927     3990   +63     
=======================================
+ Hits         9537     9540    +3     
  Misses       2552     2552           
  Partials       21       21           

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[github-actions]

Size Change: +8 B (0%)

Total Size: 441 kB

Filename	Size	Change
./dist/cjs/index.js	236 kB	+8 B (0%)

ℹ️ View Unchanged

Filename	Size
./dist/audioProcessing-BbOs2wMd.js	1.32 kB
./dist/cjs/emojis.js	2.96 kB
./dist/cjs/mp3-encoder.js	1.27 kB
./dist/css/index.css	46.9 kB
./dist/css/v2/emoji-mart.css	1.84 kB
./dist/css/v2/emoji-replacement.css	300 B
./dist/css/v2/index.css	39.4 kB
./dist/css/v2/index.layout.css	22.8 kB
./dist/WithAudioPlayback-myzUS2m6.js	89.1 kB

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