🧹 Avoid 'any' type for editorRef

[beingniloy]

🎯 What: Replaced the generic any type for editorRef in src/components/EditorArea.tsx with the specific Monaco Editor interface editor.IStandaloneCodeEditor.

💡 Why: Proper typing removes compiler-blind spots, provides full IDE autocomplete, and prevents accidental runtime regressions by enforcing type-safety.

✅ Verification: Ran pnpm lint and pnpm build to compile the TypeScript code and verify that no compilation or typechecking errors are present.

✨ Result: Improved maintainability, codebase safety, and type coverage of Monaco editor instances and callback parameter events in EditorArea.tsx.

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PR created automatically by Jules for task 4674309808284666399 started by @beingniloy

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