feat(navigation): add NavSection Holocene component

[KATIETOLER]

Adds a NavGroup component to the Holocene design system so the cloud nav can compose independent groups of
nav items — enabling other elements to be placed between groups without modifying the OSS nav.

• Add NavSection Holocene component to replace ad-hoc nav group rendering in SideNavigation
• Split getLinkList into linkList (primary) and linkListForSecondGroup (secondary) in the OSS app layout
• Tighten NavLinkItem types and clean up global.ts
• Add secondaryLinkList prop to BottomNavigation/BottomNavLinks so secondary links render in the mobile
  menu
• Add navContent?: Snippet prop to side-nav.svelte — when isCloud && navContent, renders the snippet
  instead of the inline {#each} loop; OSS path is completely unchanged
• Wire NavGroup into the cloud nav path in +layout.svelte via {#snippet navContent()}
• Refactor BottomNavigation and BottomNavLinks to accept a sections: NavLinkItem[][] API matching
  SideNavigation, replacing separate linkList/secondaryLinkList props; migrate both components to Svelte 5
  and render sections via NavSection with auto-inserted dividers

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	Apr 6, 2026 2:56pm

[temporal-cicd]

	Warnings
⚠️	📊 Strict Mode: 1 error in 1 file (0.1% of 1085 total) src/routes/(app)/+layout.svelte (1) L62:23: Argument of type '(namespace: string) => { namespace: string; onClick: (namespace: string) => void; }' is not assignable to parameter of type '(value: string | null | undefined, index: number, array: (string | null | undefined)[]) => { namespace: string; onClick: (namespace: string) => void; }'.

Generated by 🚫 dangerJS against cfc2e3f