feat(home): editorial homepage, sticky top nav, and category drill-down

Reframes the home and library-browse surfaces as an editorial review
site (Tom's Hardware / Top 10 Reviews vibe) where every block is a
teaser into a deeper page rather than a single tall landing.

New surfaces
- src/components/home/HomeEditorial.tsx: featured Start hero with
  embedded application starter, top-libraries leaderboard side rail,
  trust pillars, Trusted-By marquee, live OSS Stats deferred section,
  four "Top picks by category" cards, latest writing, tiered partners
  (Gold/Silver/Bronze), Discord + YouTube community pair.
- src/components/editorial/EditorialTopNav.tsx: sticky global top nav
  (eyebrow strip + brand + 11-item primary nav + search + compact 2x3
  social cluster + theme + mobile drawer) and a pinned Gold Partners
  strip with "Sponsored" hover tooltips.
- src/components/stack/* + src/routes/stack.\$category.tsx: four
  buyer's-guide-style category articles
  (/stack/{state,ui,performance,tooling}) with hero, Top Pick, quick
  verdict table, ranked list, criteria block, related writing and a
  sticky right-rail TOC + cross-category compare.

Global shell
- src/routes/__root.tsx: render EditorialTopNav on every page; non-
  editorial pages still wrap children with <Navbar hideHeader> so the
  contextual library left rail is preserved on docs pages.
- src/components/Navbar.tsx: add hideHeader prop. When true the global
  Navbar skips its own fixed top header and lets EditorialTopNav own
  --navbar-height (published by EditorialTopNav via ResizeObserver).

Page opt-ins
- /, /stack/\$category, /libraries, /libraries/\$framework, /partners,
  /blog, /showcase + children, /stats/npm, /merch all set
  staticData.showNavbar: false to drop the library left rail and use
  the editorial top-nav-only layout.

Data and dev DX
- src/utils/partners.tsx: promote Railway from bronze -> gold.
- src/utils/documents.server.ts: when DATABASE_URL is unset (dev
  without Postgres), fall back from getCachedGitHubTextFile to the
  in-memory fetchCached path so library docs pages render locally
  without a DB.

Notes for reviewers
- Removed deferred home sections (HomeSocialProofSection,
  HomeCommunitySection, HomeBytesSection, standalone
  HomeApplicationStarter usage) are kept as components -- only their
  homepage render is gone.
- routeTree.gen.ts is regenerated by the build; included for
  completeness.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jhislop-design

src/components/Navbar.tsx

@@ -131,7 +131,13 @@ const MobileCard = ({
   </Card>
 )
 
-export function Navbar({ children }: { children: React.ReactNode }) {
+export function Navbar({
+  children,
+  hideHeader = false,
+}: {
+  children: React.ReactNode
+  hideHeader?: boolean
+}) {
   const matches = useMatches()
 
   const { Title } = React.useMemo(() => {
@@ -145,6 +151,10 @@ export function Navbar({ children }: { children: React.ReactNode }) {
   const containerRef = React.useRef<HTMLDivElement>(null)
 
   React.useEffect(() => {
+    // When hideHeader is true, the EditorialTopNav owns --navbar-height —
+    // skip our own measurement so we don't fight it.
+    if (hideHeader) return
+
     const updateContainerHeight = () => {
       if (containerRef.current) {
         const height = containerRef.current.offsetHeight
@@ -161,7 +171,7 @@ export function Navbar({ children }: { children: React.ReactNode }) {
     return () => {
       window.removeEventListener('resize', updateContainerHeight)
     }
-  }, [])
+  }, [hideHeader])
 
   const [showMenu, setShowMenu] = React.useState(false)
   const [canLoadAuthControls, setCanLoadAuthControls] = React.useState(false)
@@ -760,12 +770,14 @@ export function Navbar({ children }: { children: React.ReactNode }) {
 
   return (
     <>
-      {navbar}
+      {hideHeader ? null : navbar}
       <div
         className={twMerge(
           `min-h-[calc(100dvh-var(--navbar-height))] flex flex-col
-          min-w-0 md:flex-row w-full transition-all duration-300
-          pt-[var(--navbar-height)]`,
+          min-w-0 md:flex-row w-full transition-all duration-300`,
+          // The fixed navbar (when shown) pushes children down; the editorial
+          // top nav is sticky/in-flow above, so we don't need extra padding.
+          hideHeader ? '' : 'pt-[var(--navbar-height)]',
         )}
       >
         {smallMenu}