Add djade linter for Django templates (Fixes #2372)

[aNsHuL5217]

Summary

This PR adds the djade linter to the project's pre-commit configuration and applies formatting fixes to existing Django templates. This ensures consistent code style (e.g., standardizing whitespace in {{ variables }}) across the codebase.

Rationale

As discussed in #2372, djade was selected over alternatives like djLint because djade is actively maintained and specifically targets Django template formatting. This aligns with the project's goal of using stable, long-term tools.

Changes

• Configuration: Added adamchainz/djade-pre-commit (v1.6.0) to .pre-commit-config.yaml.
• Formatting: Ran the linter across all files, which automatically updated inconsistent spacing in .html templates.

Verification

• Ran pre-commit run djade --all-files locally (passed formatting checks).

[sarahboyce]

Thank you! A couple of minor nitpicks

[sarahboyce]

Looks good to me!

[aNsHuL5217]

Thanks for the review and approval, @sarahboyce! I appreciate the guidance on the configuration details.

I’ll leave the commits as they are for now, assuming they will be squashed upon merging. Ready when you are!