chore(web): limit lexical css

[airslice]

Overview

Add .lexical to lexical component to avoid style pollution.

Also move float link editor into editor DOM for better organization.

What I've done

What I haven't done

How I tested

Which point I want you to review particularly

Memo

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[codecov]

Codecov Report

Merging #664 (ed8a7a3) into main (f7fe7f6) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #664      +/-   ##
==========================================
- Coverage   26.94%   26.94%   -0.01%     
==========================================
  Files        1535     1535              
  Lines      167331   167336       +5     
  Branches     3862     3862              
==========================================
  Hits        45086    45086              
- Misses     121156   121161       +5     
  Partials     1089     1089              

Flag	Coverage Δ
web	25.25% <0.00%> (-0.01%)	⬇️
web-beta	25.25% <0.00%> (-0.01%)	⬇️
web-classic	25.25% <0.00%> (-0.01%)	⬇️
web-utils	25.25% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
web/src/beta/lib/lexical/RichTextEditor/index.tsx	0.00% <0.00%> (ø)