refactor: align landing page and 404 with Calculate blueprint

- Hero: remove framer-motion, CSS stagger animations, glass pill CTA button, refined typography and scroll indicator
- Stats: remove framer-motion, Lucide icons, tighter glass cards with mono labels
- ToolsGrid: remove framer-motion, editorial section heading, 4-col xl grid
- ToolCard: replace framer-motion motion.Link with plain Link + CSS hover, compact layout (icon→title→desc→badges+arrow), ElementType icon prop
- Footer: remove framer-motion, matches sidebar footer style
- BackToTop: remove framer-motion, JS scroll progress bar (1px primary line), compact glass button
- not-found: remove framer-motion and shadcn Button, glass pill CTA, 120px mono 404, CSS stagger
- page.tsx: remove unnecessary 'use client' directive

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

components/Footer.tsx

@@ -1,47 +1,34 @@
-'use client';
-
-import { motion } from 'framer-motion';
 import { GitFork, Heart } from 'lucide-react';
 
 export default function Footer() {
   const currentYear = new Date().getFullYear();
 
   return (
-    <footer className="relative py-12 px-4">
-      <div className="max-w-6xl mx-auto border-t border-border pt-12">
-        <motion.div
-          className="flex flex-col md:flex-row items-center justify-between gap-6"
-          initial={{ opacity: 0 }}
-          whileInView={{ opacity: 1 }}
-          viewport={{ once: true }}
-          transition={{ duration: 0.6 }}
-        >
-          {/* Copyright */}
-          <p className="text-sm text-muted-foreground flex items-center gap-1">
-            © {currentYear} Kit.
-            <Heart className="h-4 w-4 text-primary shrink-0 animate-pulse" fill="currentColor" />
-                <a
-                  href="https://pivoine.art"
-                  target="_blank"
-                  rel="noopener noreferrer"
-                  title="Pivoine.Art"
-                  className="font-medium underline underline-offset-4 decoration-primary/0 hover:decoration-primary transition-all duration-300"
-                >
-                  Valknar
-                </a>
+    <footer className="relative py-10 px-6">
+      <div className="max-w-5xl mx-auto border-t border-border/20 pt-8">
+        <div className="flex items-center justify-between">
+          <p className="flex items-center gap-1 text-[9px] text-muted-foreground/40 font-mono">
+            © {currentYear} Kit
+            <Heart className="w-2 h-2 text-primary/70 shrink-0 animate-pulse" fill="currentColor" />
+            <a
+              href="https://pivoine.art"
+              target="_blank"
+              rel="noopener noreferrer"
+              className="hover:text-foreground/70 transition-colors"
+            >
+              Valknar
+            </a>
           </p>
-
-          {/* Source link */}
           <a
             href="https://dev.pivoine.art/valknar/kit-ui"
             target="_blank"
             rel="noopener noreferrer"
             title="View source"
-            className="text-muted-foreground hover:text-primary transition-colors duration-300"
+            className="text-muted-foreground/30 hover:text-primary transition-colors"
           >
-            <GitFork className="h-5 w-5" />
+            <GitFork className="w-3.5 h-3.5" />
           </a>
-        </motion.div>
+        </div>
       </div>
     </footer>
   );