feat:: a11y, font rasterization, and more fixes.

[broisnischal]

Summary

This PR improves the Monaco editor experience by introducing JetBrains Mono as the dedicated code font, refining editor typography and configuration for better readability, and enhancing keyboard accessibility across the UI.

Changes

• Added JetBrains Mono as the dedicated Monaco editor font and updated all editor instances to use the new editorFontFamily() helper.
• Improved Monaco editor configuration with updated font metrics, font weight, letter spacing, cursor styling, overflow widgets, and proper font remeasurement after loading.
• Updated Monaco widget styles to consistently use the dedicated editor font.
• Improved keyboard accessibility by refining sidebar navigation, adding appropriate accessibility roles, and supporting Escape to cancel forms and clear selections.
• Applied a minor UI polish by making the Studio logo container fully rounded.

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Latest commit: 108f695

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