feat: use fonts from weblate-fonts package

[nijel]

This simplifies packaging.

[Copilot]

Pull request overview

This pull request migrates font assets from a locally managed vendor directory to the external weblate-fonts package, simplifying packaging and dependency management.

Changes:

• Replace local font CSS files with references to the weblate-fonts package
• Add weblate-fonts==2026.1 dependency to requirements.txt and register the app in Django settings
• Remove font download/management scripts and local font files

Reviewed changes

Copilot reviewed 5 out of 25 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
weblate_web/templates/base.html	Updates CSS link paths from vendor/font-source/ to weblate_fonts/
weblate_web/static/pdf/fonts.css	Updates TTF font paths for PDF rendering to use weblate_fonts/source-sans/ttf/
weblate_web/settings.py	Adds weblate_fonts to INSTALLED_APPS
requirements.txt	Adds weblate-fonts==2026.1 dependency
scripts/update-fonts	Removes font download script (no longer needed)
scripts/fonts.toml	Removes font configuration file (no longer needed)
weblate_web/static/vendor/font-source/*	Removes locally bundled font files and CSS

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.19%. Comparing base (1a42ec4) to head (b3f0189).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3358   +/-   ##
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  Coverage   81.19%   81.19%           
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  Files          64       64           
  Lines        6765     6765           
  Branches      702      702           
=======================================
  Hits         5493     5493           
  Misses       1013     1013           
  Partials      259      259           

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