feat(editor): add Prettify button to input panel

[KushalLukhi]

Summary

Add a Prettify button to the editable editor toolbar so users can format input directly in the app.

Closes #405

What changed

• Added a Prettify toolbar button in EditorPanel (editable mode only).
• Wired it to Monaco's built-in editor.action.formatDocument action.
• Added optional onMount support in components/Monaco.tsx so parent components can access editor actions safely.
• Kept result/non-editable panels unchanged (hasPrettier={false} already used there).

UX behavior

• Clicking Prettify formats current input document in place.
• If a formatter is unavailable for the current input type, a warning toast is shown instead of failing silently.

Notes

• Existing behavior for copy/load/clear/settings remains unchanged.
• This is intentionally scoped to editor UX and does not alter conversion logic.

[vercel]

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