feat(ui): hide scrollbar

[o-az]

this pr hides ugly browser default scrollbar while maintaining scrollbar functionality

b4

after

Summary by CodeRabbit

• Style
  • Updated scrollbar styling and behavior in the web app.

[coderabbitai]

Walkthrough

The changes involve adding scrollbar-related entries to both dictionary.txt and site/src/app.css. The addition in dictionary.txt seems to be a simple update to a list, while the changes in site/src/app.css are more substantial, introducing styles for webkit scrollbars and support for the scrollbar-gutter property.

Changes

File	Summary
dictionary.txt	Addition of the "scrollbars" entry to the list.
site/src/app.css	Introduces changes related to scrollbar styling and behavior, adding styles for webkit scrollbars and introducing support for the scrollbar-gutter property.

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