Migrate CategoriesFragment to Compose

[frett]

Summary

• Rewrites CategoriesFragment to use Jetpack Compose (LazyColumn + RenderArticleCategory) in place of DataBinding/RecyclerView
• Removes CategoriesAdapter and all associated XML layouts/drawables/styles
• Cleans up unused dependencies (constraintlayout, recyclerview, viewBinding, gtoSupport.picasso, etc.) from article-renderer

Test plan

• Open the article renderer categories screen and verify categories render correctly
• Tap a category and verify navigation to the articles list works
• Verify analytics screen event (SCREEN_CATEGORIES) fires on resume

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.24%. Comparing base (e91de5a) to head (9753065).

Files with missing lines	Patch %	Lines
...dtools/article/ui/categories/CategoriesFragment.kt	0.00%	26 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4440   +/-   ##
========================================
  Coverage    52.24%   52.24%           
========================================
  Files          457      456    -1     
  Lines        12170    12170           
  Branches      2109     2108    -1     
========================================
  Hits          6358     6358           
  Misses        5192     5192           
  Partials       620      620           

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[frett]

@tjohnson009 this is maintenance work of trying to move away from databinding

[tjohnson009]

Why do we want to move away from databinding?