Add story categories and populations to Story and StoryIdea forms#732

Draft

Copilot wants to merge 3 commits intomainfrom

copilot/add-story-categories-populations

Commits on Jan 20, 2026

Initial plan
Copilot
committed
Add story_populations and categorizable associations to Story and StoryIdea models

Copilot
and
maebeale
committed
Add story_categories scope to Category model and update controllers

Copilot
and
maebeale
committed