feat: Upgrade to Next.js 16.1 & React 19.2, migrate to Supabase SSR with async client handling

src/lib/supabase/client.ts

@@ -0,0 +1,8 @@
+import { createBrowserClient } from '@supabase/ssr';
+
+export function createClient() {
+    return createBrowserClient(
+        process.env.NEXT_PUBLIC_SUPABASE_URL!,
+        process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!
+    );
+}

src/lib/supabase/server.ts

@@ -0,0 +1,29 @@
+import { createServerClient, type CookieOptions } from '@supabase/ssr';
+import { cookies } from 'next/headers';
+
+export async function createClient() {
+    const cookieStore = await cookies();
+
+    return createServerClient(
+        process.env.NEXT_PUBLIC_SUPABASE_URL!,
+        process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
+        {
+            cookies: {
+                getAll() {
+                    return cookieStore.getAll();
+                },
+                setAll(cookiesToSet: { name: string; value: string; options: CookieOptions }[]) {
+                    try {
+                        cookiesToSet.forEach(({ name, value, options }) =>
+                            cookieStore.set(name, value, options)
+                        );
+                    } catch {
+                        // The `setAll` method was called from a Server Component.
+                        // This can be ignored if you have middleware refreshing
+                        // user sessions.
+                    }
+                },
+            },
+        }
+    );
+}