FilterDropdownComponent & SourcesFilterPresenter

What Was Built

• FilterDropdownComponent: Reusable ViewComponent for labeled filter selects with auto-submit, consistent Tailwind styling, and Ransack form builder support. Added view_component (~> 3.0) as a runtime engine dependency.
• SourcesFilterPresenter: Plain Ruby presenter encapsulating filter state logic (active filter detection, label generation, adapter options) previously inline in the sources index template.
• View refactoring: Sources index uses component for all 5 filter dropdowns and presenter for filter state banner. Logs index uses component for timeframe dropdown. Items index had no applicable dropdowns.

Commits

Hash	Message
cafefc2	feat(05-02): add FilterDropdownComponent with ViewComponent
795b7b8	feat(05-02): add SourcesFilterPresenter for filter state logic
140d0e4	refactor(05-02): use FilterDropdownComponent and SourcesFilterPresenter in sources index
c3360c6	refactor(05-02): use FilterDropdownComponent in logs index
489277b	style(05-02): fix rubocop offenses in component files

Tasks Completed

1. FilterDropdownComponent test (8 tests) and implementation -- GREEN
2. SourcesFilterPresenter test (11 tests) and implementation -- GREEN
3. Sources index refactored to use component and presenter; controller builds presenter with adapter_options query and row preload comment
4. Logs index timeframe select replaced with FilterDropdownComponent; items index unchanged (no dropdown filters)
5. Verification: 1533 tests pass, 0 failures; rubocop clean on all modified files

Files Modified

• source_monitor.gemspec -- added view_component dependency
• Gemfile.lock -- updated lockfile
• app/components/source_monitor/application_component.rb -- new base component
• app/components/source_monitor/filter_dropdown_component.rb -- new filter dropdown component
• app/presenters/source_monitor/sources_filter_presenter.rb -- new filter state presenter
• app/views/source_monitor/sources/index.html.erb -- replaced inline filters with component/presenter
• app/views/source_monitor/logs/index.html.erb -- replaced timeframe select with component
• app/controllers/source_monitor/sources_controller.rb -- builds @filter_presenter, moved adapter_options query
• test/components/source_monitor/filter_dropdown_component_test.rb -- 8 component tests
• test/presenters/source_monitor/sources_filter_presenter_test.rb -- 11 presenter tests

Deviations

• Items index (items/index.html.erb) has no dropdown filter selects (only a search bar), so no FilterDropdownComponent was applied there. The plan mentioned it should use the component "for their filter selects" but none exist. This is a DEVN-01 (minor scope clarification, no escalation needed).
• Logs index has button-group filters (status/type) and form fields (search, datetimes, IDs) that don't match the dropdown pattern. Only the timeframe select was replaced. This is expected behavior, not a deviation.