fix: font & box shadow fixes

[arnautov-anton]

Fixes: #3134

• moves Geist font import to the example application
• adds --str-chat__ prefix to example application variables (used from {light,dark}.scss files)
• adjusts certain selectors to respect design-spec fonts/shadows

[github-actions]

Size Change: -289 B (-0.05%)

Total Size: 618 kB

📦 View Changed

Filename	Size	Change
dist/css/index.css	39.1 kB	-289 B (-0.73%)

ℹ️ View Unchanged

Filename	Size
dist/cjs/audioProcessing.js	1.32 kB
dist/cjs/emojis.js	3.01 kB
dist/cjs/index.js	240 kB
dist/cjs/mp3-encoder.js	1.27 kB
dist/cjs/WithAudioPlayback.js	44.7 kB
dist/css/emoji-picker.css	178 B
dist/css/emoji-replacement.css	456 B
dist/es/audioProcessing.mjs	1.31 kB
dist/es/emojis.mjs	2.52 kB
dist/es/index.mjs	239 kB
dist/es/mp3-encoder.mjs	756 B
dist/es/WithAudioPlayback.mjs	44.5 kB

_{compressed-size-action}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.33%. Comparing base (1a2a61f) to head (92626c1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3135   +/-   ##
=======================================
  Coverage   82.33%   82.33%           
=======================================
  Files         419      419           
  Lines       12269    12269           
  Branches     3950     3950           
=======================================
  Hits        10102    10102           
  Misses       2167     2167           

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