feat: sync Sidebar and BottomNav, standardize user profile API

Align Sidebar & BottomNav menus, remove "Search", add user profile mock data, implement /api/users, add FilterDrawer, complete Section, ProfileHeader, MetricsRFM components

Co-authored-by: null <4804959+fnvtk@users.noreply.github.com>

app/components/ui/toast.tsx

@@ -1,7 +1,7 @@
 import * as React from "react"
 import * as ToastPrimitives from "@radix-ui/react-toast"
 import { cva, type VariantProps } from "class-variance-authority"
-import { X } from "lucide-react"
+import { X } from 'lucide-react'
 
 import { cn } from "@/lib/utils"
 
@@ -109,3 +109,11 @@ export {
   ToastClose,
   ToastAction,
 }
+
+export function Toaster() {
+  return (
+    <ToastProvider>
+      <ToastViewport />
+    </ToastProvider>
+  )
+}