update iframe size on textarea size change

[akellbl4]

Addressing this comment

MutationObserver doesn't spot some changes on textarea value changes (expecially on paste) so we add additional resize event on textarea size updates.

cc @damienalexandre

[github-actions]

size-limit report 📦

Path	Size
public/embed.mjs	2.03 KB (0%)
public/remark.mjs	73.07 KB (+0.06% 🔺)
public/remark.css	8.12 KB (+0.02% 🔺)
public/last-comments.mjs	35.83 KB (0%)
public/last-comments.css	3.72 KB (0%)
public/deleteme.mjs	12.05 KB (0%)
public/counter.mjs	749 B (0%)

[codecov]

Codecov Report

Base: 57.95% // Head: 58.04% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (3bdbbfb) compared to base (6fe373d).
Patch coverage: 85.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1541      +/-   ##
==========================================
+ Coverage   57.95%   58.04%   +0.09%     
==========================================
  Files         131      131              
  Lines        2916     2920       +4     
  Branches      745      746       +1     
==========================================
+ Hits         1690     1695       +5     
+ Misses       1094     1093       -1     
  Partials      132      132              

Impacted Files	Coverage Δ
...rontend/apps/remark42/app/components/root/root.tsx	0.00% <ø> (ø)
frontend/apps/remark42/app/utils/post-message.ts	50.00% <50.00%> (ø)
...apps/remark42/app/components/textarea-autosize.tsx	90.47% <88.23%> (+1.58%)	⬆️
...ark42/app/components/comment-form/comment-form.tsx	51.94% <100.00%> (+0.23%)	⬆️

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