SourceDetailsPresenter Extraction

What Was Built

• BasePresenter (SimpleDelegator) base class with ActionView number/date/text helpers
• SourceDetailsPresenter wrapping Source model with formatted display methods: fetch_interval_display, circuit_state_label, adaptive_interval_label, details_hash, formatted_next_fetch_at, formatted_last_fetched_at
• Updated _details.html.erb to use presenter instead of ~30 lines of inline hash building and formatting logic
• 23 unit tests covering all presenter methods including delegation, nil handling, and conditional formatting

Commits

• 7c2604b feat(05-01): extract SourceDetailsPresenter from _details.html.erb

Tasks Completed

1. Created BasePresenter and wrote 23 SourceDetailsPresenter tests (TDD red)
2. Implemented SourceDetailsPresenter with all required methods (TDD green)
3. Updated _details.html.erb to instantiate presenter and use details_hash
4. Verified: presenter tests pass, controller tests pass, full suite (1522 tests) pass, RuboCop zero offenses on new files

Files Modified

• app/presenters/source_monitor/base_presenter.rb (new) -- SimpleDelegator base class
• app/presenters/source_monitor/source_details_presenter.rb (new) -- presenter with formatting methods
• test/presenters/source_monitor/source_details_presenter_test.rb (new) -- 23 tests
• app/views/source_monitor/sources/_details.html.erb (modified) -- replaced inline logic with presenter calls

Deviations

• Website row kept in template (not in details_hash) because it requires the external_link_to view helper which is not available in the presenter without view_context. This is a minor scope adjustment (DEVN-01) that preserves identical rendered output.
• 48 pre-existing RuboCop offenses detected (DEVN-05) -- all in unmodified files, zero offenses in new presenter files.