Memoize Monaco options in AdvancedCodeEditor

[Jerry-Tekh]

Summary

• memoize the Monaco editor options so content updates keep a stable configuration reference
• limit option invalidation to font size, autocomplete, and language indentation changes
• add regression coverage for content and editor-setting updates

Testing

• node_modules/.bin/tsc --noEmit
• node_modules/.bin/eslint src/components/code/AdvancedCodeEditor.tsx src/components/code/__tests__/AdvancedCodeEditor.test.tsx --no-ignore
• node_modules/.bin/prettier --check src/components/code/AdvancedCodeEditor.tsx src/components/code/__tests__/AdvancedCodeEditor.test.tsx
• node_modules/.bin/vitest run src/components/code/__tests__/AdvancedCodeEditor.test.tsx

Closes #976

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