v4.0.0-beta.5

What's Changed

• Resize handle styling — thinner, lighter idle bar using Tailwind v4 color tokens with better contrast on Filament/Primo light headers
• Asset build pipeline — CSS is copied to resources/dist/css/ during npm run build; Filament assets register from resources/dist/
• Pin icon fix — resize only starts from column edge zones; sticky pin gutter clicks no longer trigger resize
• Sticky shadow — pinned header cells now receive sticky-shadow-active while horizontally scrolled

Full Changelog: v4.0.0-beta.4...v4.0.0-beta.5