Summary

Add automated formatting tooling for the codebase: Prettier for JS/CSS and a formatter for Django HTML templates. Includes initial reformatting pass, CI integration, and pre-commit hooks.

Motivation

The codebase has inconsistent formatting across CSS, JS, and HTML files, making diffs noisy and code review harder. Automated formatters eliminate style debates and keep contributions consistent.

Scope

• Prettier: Configure for JS and CSS files (.prettierrc, .prettierignore)
• Django template formatter: Find and configure a tool for HTML template formatting
• Pre-commit hooks: Add formatters to .pre-commit-config.yaml
• CI: Add formatting check step to GitHub Actions
• Just commands: Add just format / just lint shortcuts
• Initial reformat: Run formatters across all existing files
• Docs: Update README with vendor JS policy and any setup required for both existing and future devs.