fix: settings ui improvements

[Xazin]

PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.64%. Comparing base (94f9349) to head (aaeca57).
Report is 822 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##            main    #5590       +/-   ##
==========================================
+ Coverage   9.70%   86.64%   +76.94%     
==========================================
  Files        685      217      -468     
  Lines      31812     5032    -26780     
  Branches       0      831      +831     
==========================================
+ Hits        3086     4360     +1274     
+ Misses     28726      564    -28162     
- Partials       0      108      +108     

Flag	Coverage Δ
appflowy_flutter_unit_test	?
appflowy_web_app	86.64% <ø> (?)

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