Keep header dropdown labels on one line

[apples-kksk]

Fixes #1179.

Summary

• widen the editor header dropdown so icon, padding, and label fit at non-default zoom levels
• keep the header menu labels on a single line
• keep icon sizing stable so labels do not wrap around the icon

Verification

• npx prettier --write src/cloud/components/Editor/styled.ts src/cloud/components/Editor/EditorHeaderToolDropdown.tsx
• npx eslint src/cloud/components/Editor/styled.ts src/cloud/components/Editor/EditorHeaderToolDropdown.tsx --ext .ts,.tsx
• npx tsc --noEmit --pretty false
• git diff --check

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IssueHunt Summary

Referenced issues

This pull request has been submitted to:

• #1179: Add header text (Toolbar) breaks with non default zoom value

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