Add document editing for resumes and cover letters

[UmairJibran]

closes #67

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[gemini-code-assist]

Summary of Changes

Hello @UmairJibran, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the application management system by providing users with the ability to directly modify their generated resumes and cover letters. This new functionality allows for greater control and customization of application documents, moving beyond simple regeneration to direct content manipulation, and ensuring that users can fine-tune their materials before submission.

Highlights

• Document Editing Feature: Introduced a new DocumentEditor component that allows users to directly edit the raw content of their generated resumes and cover letters within the application dialog.
• UI Integration: Added 'Edit' buttons next to the resume and cover letter sections in the ApplicationDialog, which trigger the DocumentEditor when clicked.
• API and State Management: Implemented a new API endpoint and a corresponding React Query hook (useUpdateDocument) to handle saving the edited document data to the backend, ensuring the changes are persisted and the PDF is regenerated.
• Data Handling: The DocumentEditor intelligently handles resume data as JSON (with validation) and cover letter data as plain text, providing appropriate editing experiences for each.

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[gemini-code-assist]

Code Review

This pull request introduces a new feature allowing users to edit their resumes and cover letters directly within the application dialog. It adds a new DocumentEditor component for this purpose, along with the necessary API client methods and hooks to update the documents on the backend. The changes are well-structured. I've identified a couple of areas for improvement related to code duplication and error handling to enhance maintainability and user experience.