Add mobile bottom tab bar for small screen navigation

- New MobileTabBar component with Home, Search, and Account tabs
- Animated indicator follows active tab (spring layoutId transition)
- Shown only below sm breakpoint where desktop nav links are hidden
- Account tab provides quick sign-out access
- Safe area padding for devices with home indicators
- Added bottom padding to layout to prevent content overlap

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/(pages)/layout.tsx

@@ -3,6 +3,7 @@
 import { CommandPalette } from "@/components/command-palette";
 import { KeyboardHelpDialog } from "@/components/keyboard-help-dialog";
 import { KeyboardProvider } from "@/components/keyboard-provider";
+import { MobileTabBar } from "@/components/mobile-tab-bar";
 import { NavBar } from "@/components/nav-bar";
 import { Toaster } from "@/components/ui/sonner";
 
@@ -13,7 +14,7 @@ export default function PagesLayout({
 }) {
   return (
     <KeyboardProvider>
-      <div className="min-h-screen">
+      <div className="min-h-screen pb-14 sm:pb-0">
         <NavBar />
         {/* Ambient glow */}
         <div className="pointer-events-none fixed left-1/2 top-1/4 -translate-x-1/2 -translate-y-1/2 h-[600px] w-[800px] rounded-full bg-primary/3 blur-[200px]" />
@@ -21,6 +22,7 @@ export default function PagesLayout({
           {children}
         </main>
       </div>
+      <MobileTabBar />
       <CommandPalette />
       <KeyboardHelpDialog />
       <Toaster position="bottom-right" />

components/mobile-tab-bar.tsx

@@ -0,0 +1,78 @@
+"use client";
+
+import { IconHome, IconSearch, IconUser } from "@tabler/icons-react";
+import { motion } from "motion/react";
+import Link from "next/link";
+import { usePathname, useRouter } from "next/navigation";
+import { signOut, useSession } from "@/lib/auth/client";
+
+const tabs = [
+  { href: "/dashboard", label: "Home", icon: IconHome },
+  { href: "/search", label: "Search", icon: IconSearch },
+] as const;
+
+export function MobileTabBar() {
+  const { data: session } = useSession();
+  const pathname = usePathname();
+  const router = useRouter();
+
+  if (!session?.user) return null;
+
+  return (
+    <nav className="fixed bottom-0 left-0 right-0 z-50 border-t border-border/50 bg-background/90 backdrop-blur-xl sm:hidden">
+      <div className="flex h-14 items-stretch">
+        {tabs.map((tab) => {
+          const Icon = tab.icon;
+          const isActive =
+            tab.href === "/dashboard"
+              ? pathname === "/dashboard"
+              : pathname.startsWith(tab.href);
+          return (
+            <Link
+              key={tab.href}
+              href={tab.href}
+              className="relative flex flex-1 flex-col items-center justify-center gap-0.5"
+            >
+              <Icon
+                size={20}
+                className={isActive ? "text-primary" : "text-muted-foreground"}
+              />
+              <span
+                className={`text-[10px] font-medium ${isActive ? "text-primary" : "text-muted-foreground"}`}
+              >
+                {tab.label}
+              </span>
+              {isActive && (
+                <motion.div
+                  layoutId="mobile-tab-indicator"
+                  className="absolute top-0 h-0.5 w-8 rounded-full bg-primary"
+                  transition={{
+                    type: "spring",
+                    stiffness: 380,
+                    damping: 30,
+                  }}
+                />
+              )}
+            </Link>
+          );
+        })}
+        <button
+          type="button"
+          onClick={async () => {
+            await signOut();
+            router.push("/");
+            router.refresh();
+          }}
+          className="flex flex-1 flex-col items-center justify-center gap-0.5"
+        >
+          <IconUser size={20} className="text-muted-foreground" />
+          <span className="text-[10px] font-medium text-muted-foreground">
+            {session.user.name?.split(" ")[0] ?? "Account"}
+          </span>
+        </button>
+      </div>
+      {/* Safe area for devices with home indicator */}
+      <div className="h-[env(safe-area-inset-bottom)]" />
+    </nav>
+  );
+}