Fix/system hardening

[Ashminita28]

Description

This PR fixes arbitary file read in export , adds css sanitization tests, and fixes the marked instance recreation.

Type of Change

• Bug fix
• New feature
• Refactor (no functional change)
• Documentation update
• Style / UI change
• Build / CI change

Related Issue

Closes #93, #94, #95

Checklist

• My code follows the project's coding guidelines
• I have tested my changes locally
• I have used conventional commit messages
• I have updated documentation if needed
• My changes do not introduce new warnings or errors

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 7ecaac66-dfaa-4d5f-835c-c1cc8d48b904

📥 Commits

Reviewing files that changed from the base of the PR and between e621a5f and 2580340.

📒 Files selected for processing (15)

• apps/main-processor/__tests__/export.test.ts
• apps/main-processor/__tests__/ipc.test.ts
• apps/main-processor/__tests__/settings.test.ts
• apps/main-processor/src/export/inlineImage.ts
• apps/main-processor/src/folder.ts
• apps/main-processor/src/utils/constants/export-constants.ts
• apps/main-processor/src/utils/constants/ipc-validation.ts
• apps/main-processor/src/utils/helper/setting-helper.ts
• apps/renderer/__tests__/config/marked.test.ts
• apps/renderer/__tests__/renderer/markdown.test.ts
• apps/renderer/src/App.tsx
• apps/renderer/src/config/marked.ts
• apps/renderer/src/hooks/useFilePersistence.ts
• apps/renderer/src/types/component-types.ts
• apps/renderer/src/utils/constants/theme-constants.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/system-hardening

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