mroderick / codebar-planner / 23072869847

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feat(views): replace chapters sidebar with ViewComponent

Replace the inline HAML chapters sidebar on the homepage with a reusable
ViewComponent that includes Rails fragment caching.

Changes:
- Add view_component gem to Gemfile
- Create ChaptersSidebarComponent with ERB template
- Component accepts chapters collection and optional title
- Add fragment caching with static cache key
- Add cache expiration callbacks to Chapter model (create/update/destroy)
- Add component spec with ViewComponent test helpers
- Add view spec for dashboard integration
- Add cache expiration specs to chapter model spec
- Fix Rails 7.1 deprecation (fixture_path -> fixture_paths)
- Simplify spec_helper configuration

The component uses a static cache key that is expired via model
callbacks when chapters are created, updated, or deleted. This
provides better performance while ensuring cache invalidation.

Testing:
- All 880 tests pass
- Component tested for rendering and cache behavior
- Cache expiration verified for create/update/destroy operations

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