* fix(frontend): align Monaco editor font size with text-xs across viewports
* fix(frontend): make placeholder lineHeight reactive to fontSize
* fix(frontend): align GraphQL schema viewer font size with text-xs
The read-only GraphQL schema viewer was the lone Monaco instance still
inheriting Monaco's 14px default. Wire it through editorFontSize like
the other editors so it stays in sync with text-xs across viewports.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>