Half Baked Category Colours

Half Baked Category Colours adds a per-category colour picker and applies those colours sitewide wherever categories are displayed.

Highlights * Set a colour per category on Posts → Categories (add/edit). * Optional default category colour (used when a category has no specific colour). * Optional pill styling (rounded borders + padding), plus controls for: * Pill gap * Border thickness * Pill shape * Background tint * Underline * Category list screen improvements: * Colour swatch column * Quick Edit colour picker * Optional category name case tools (categories only; no exceptions list): * Storage case style (used by normalization) * Auto-apply on create/edit * Force display case (front end) * Normalize all categories now