feat: add UI component files and navigation structure

Added various UI components and navigation elements including:
- Section cards and selection components
- Social icon SVGs with horizontal/vertical text variants
- Table, tabs, and toggle components
- Site header and sidebar components
- Tooltip and unauthorized page
- Project configuration files (tsconfig.json)
- Route handlers for health checks
- Utility and hook functions for mobile responsiveness

app/(dev)/showcase/layout.tsx

@@ -0,0 +1,24 @@
+import { AppSidebar } from "@components/app-sidebar"
+import { SidebarInset, SidebarProvider } from "@components/ui/sidebar"
+import { SiteHeader } from "@components/site-header"
+
+export default function ShowcaseLayout({ children }: { children: React.ReactNode }) {
+  return (
+    <SidebarProvider
+      style={
+        {
+          "--sidebar-width": "calc(var(--spacing) * 72)",
+          "--header-height": "calc(var(--spacing) * 12)",
+        } as React.CSSProperties
+      }
+    >
+      <AppSidebar variant="inset" />
+      <SidebarInset>
+        <SiteHeader />
+        <div className="flex flex-1 flex-col">
+          <div className="@container/main flex flex-1 flex-col gap-2">{children}</div>
+        </div>
+      </SidebarInset>
+    </SidebarProvider>
+  )
+}