Controller DRY & Robustness

Task 1: Extract SetSource Concern (M6)

• Created SetSource concern with set_source finding by params[:source_id]
• Included in 7 controllers, removed duplicated private methods
• Commit: cb2cb2a

Task 2: Add rescue_from RecordNotFound + Guard fallback_user_id (M5, M7, L1)

• Added rescue_from ActiveRecord::RecordNotFound to ApplicationController with Turbo-aware response
• Guarded fallback_user_id behind Rails.env.development?
• Documented wizard new action HTTP semantics
• Commit: b2045dc

Task 3: Extract Source.enable_scraping! + Strong Params (M10, L2)

• Moved bulk scrape enablement logic to Source.enable_scraping! class method
• Added proper strong params wrapper in BulkScrapeEnablementsController
• Commit: 6ccc157

Task 4: Document to_unsafe_h Usage (L7)

• Added inline documentation explaining why to_unsafe_h is used (Ransack dynamic keys)
• Commit: ecdae04

Task 5: Tailwind Classes in Controller (L4)

• Addressed as part of StatusBadgeComponent extraction in Plan 04
• No separate commit needed (cross-plan dependency resolved)