feat: add font size control to increase/decrease editor font size

[devendra-w]

Summary

Adds a font size control (− and + buttons) to the toolbar that lets users increase or decrease the Monaco editor font size. The preference is persisted in localStorage.

Closes #142

Type of Change

• New feature

Changes Made

• Added fontSize state to app/page.tsx initialized to 14px
• Added useEffect to load saved font size from localStorage on mount
• Added font size control UI (− size +) to the toolbar between Download and theme toggle
• Passed fontSize prop to all 6 MonacoEditor instances
• Added fontSize prop to MonacoEditorProps interface in app/components/monaco-editor.tsx
• Added useEffect in monaco-editor.tsx to call editor.updateOptions({ fontSize }) when prop changes

How to Test

1. Run npm install and npm run dev
2. Navigate to http://localhost:3000
3. Click + in the toolbar - verify editor font size increases
4. Click − - verify font size decreases
5. Refresh the page - verify font size is remembered

Screenshots

Checklist

• Linked issue in summary
• Self-reviewed the diff
• Added/updated tests if applicable

[vercel]

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[netlify]

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[devendra-w]

Hi @Debmallya-03 ! I've resolved the merge conflicts. All changes are in place font size control with localStorage persistence, passed to all Monaco editor instances. Ready for review!