refac: use resize observer instead of mutation observer

[akellbl4]

Refactor resizing mechanism with more sutable browser API.

[akellbl4]

Not sure if it's a good idea to listen on body.

[github-actions]

size-limit report 📦

Path	Size
public/embed.mjs	2.03 KB (0%)
public/remark.mjs	72.67 KB (-0.2% 🔽)
public/remark.css	8.12 KB (-0.02% 🔽)
public/last-comments.mjs	35.65 KB (+0.01% 🔺)
public/last-comments.css	3.72 KB (-0.03% 🔽)
public/deleteme.mjs	12.05 KB (0%)
public/counter.mjs	749 B (0%)

[codecov]

Codecov Report

Base: 58.04% // Head: 58.02% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (9d7a807) compared to base (68b8468).
Patch coverage: 59.09% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1547      +/-   ##
==========================================
- Coverage   58.04%   58.02%   -0.03%     
==========================================
  Files         131      131              
  Lines        2920     2911       -9     
  Branches      746      743       -3     
==========================================
- Hits         1695     1689       -6     
+ Misses       1093     1091       -2     
+ Partials      132      131       -1     

Impacted Files	Coverage Δ
...ark42/app/components/comment-form/comment-form.tsx	51.70% <ø> (-0.24%)	⬇️
...rontend/apps/remark42/app/components/root/root.tsx	0.00% <0.00%> (ø)
frontend/apps/remark42/app/utils/post-message.ts	50.00% <ø> (ø)
...apps/remark42/app/components/textarea-autosize.tsx	88.88% <84.61%> (-1.59%)	⬇️
...nd/apps/remark42/app/components/auth/auth.hooks.ts	91.02% <100.00%> (-1.29%)	⬇️

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