added better navigation in release version page

Fixes #16

src/app/release-notes/[version]/page.tsx

@@ -1,5 +1,6 @@
 "use client";
 
+import React, { useState, useCallback } from 'react';
 import Footer from "@/components/footer";
 import { Navigation } from "@/components/navigation";
 import ReleaseNote from "@/components/release-note";
@@ -7,6 +8,50 @@ import { Button } from "@/components/ui/button";
 import { releaseNotes } from "@/lib/release-notes";
 import Link from "next/link";
 import { redirect, useParams } from "next/navigation";
+import { ChevronLeft, ChevronRight, ChevronDown } from 'lucide-react';
+
+const VersionList = React.memo(({ currentVersion }: { currentVersion: string }) => {
+  const [isOpen, setIsOpen] = useState(false);
+
+  const toggleDropdown = useCallback(() => {
+    setIsOpen(prev => !prev);
+  }, []);
+
+  return (
+    <div className="fixed right-0 lg:right-0 top-20 z-10 pr-2">
+      <div className="relative">
+        <Button
+          variant="outline"
+          className="w-full flex justify-between items-center lg:w-auto"
+          onClick={toggleDropdown}
+        >
+          {currentVersion}
+          <ChevronDown className={`ml-2 h-4 w-4 transition-transform ${isOpen ? 'rotate-180' : ''}`} />
+        </Button>
+        {isOpen && (
+          <div className="absolute top-full right-0 mt-2 w-full lg:w-48 bg-background border rounded-md shadow-lg max-h-[60vh] overflow-y-auto">
+            {releaseNotes.map((note) => (
+              <Link 
+                key={note.version} 
+                href={`/release-notes/${note.version}`}
+                className={`block px-4 py-2 text-sm ${
+                  note.version === currentVersion 
+                    ? 'bg-primary text-primary-foreground' 
+                    : 'hover:bg-accent'
+                }`}
+                onClick={toggleDropdown}
+              >
+                {note.version}
+              </Link>
+            ))}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+});
+
+VersionList.displayName = 'VersionList';
 
 export default function ReleaseNotePage() {
   const params = useParams<{ version: string }>();
@@ -16,7 +61,9 @@ export default function ReleaseNotePage() {
     return redirect(`/release-notes/${releaseNotes[0].version}`);
   }
 
-  const releaseNote = releaseNotes.find((note) => note.version === version);
+  const currentIndex = releaseNotes.findIndex((note) => note.version === version);
+  const releaseNote = releaseNotes[currentIndex];
+  
   if (!releaseNote) {
     return (
       <main className="flex min-h-screen flex-col items-center justify-center">
@@ -33,9 +80,37 @@ export default function ReleaseNotePage() {
       </main>
     );
   }
+
+  const prevNote = releaseNotes[currentIndex + 1];
+  const nextNote = releaseNotes[currentIndex - 1];
+
   return (
-    <main className="flex min-h-screen flex-col items-center justify-center">
+    <main className="flex min-h-screen flex-col items-center justify-between">
-      <ReleaseNote data={releaseNote} />
+      <VersionList currentVersion={version} />
+      
+      <div className="w-full max-w-4xl px-4 py-2">
+        <ReleaseNote data={releaseNote} />
+      </div>
+      
+      <div className="flex justify-between w-full max-w-4xl px-4 py-4">
+        {prevNote && (
+          <Link href={`/release-notes/${prevNote.version}`}>
+            <Button variant="outline" className="flex items-center">
+              <ChevronLeft className="mr-2 h-4 w-4" />
+              Previous ({prevNote.version})
+            </Button>
+          </Link>
+        )}
+        {nextNote && (
+          <Link href={`/release-notes/${nextNote.version}`} className="ml-auto">
+            <Button variant="outline" className="flex items-center">
+              Next ({nextNote.version})
+              <ChevronRight className="ml-2 h-4 w-4" />
+            </Button>
+          </Link>
+        )}
+      </div>
+      
       <Footer />
       <Navigation /> {/* At the bottom of the page */}
     </main>