[FEATURE] Support in-line Latex math

[dingyifei]

Feature Description

The frontend doesn't render latex like $$P \approx L \times A$$

Target Deployment

• SurfSense Cloud (hosted version)
• Self-hosted version
• Both

Problem Statement

It's nice to have all mathmatical formulas correctly displayed

Proposed Solution

Automatically render LaTeX math in markdown

Alternative Solutions

Benefits

• better user experience to surfsense users

Use Case Examples

1. User request "can you show me the formula used in xxxx", surfsense respond with correctly rendered output

Additional Context

Implementation Considerations

• This may require frontend changes
• This may require backend changes
• This may require database changes
• This may affect existing features

Checklist

• I have searched existing issues/feature requests to ensure this is not a duplicate
• I have provided a clear description of the feature
• I have added appropriate labels (enhancement, deployment type)