feat[session]: increase session durations for better UX

sim/app/lib/auth.ts

@@ -37,8 +37,11 @@ export const auth = betterAuth({
   session: {
     cookieCache: {
       enabled: true,
-      maxAge: 5 * 60, // Cache duration (5 minutes)
+      maxAge: 24 * 60 * 60, // 24 hours in seconds
     },
+    expiresIn: 30 * 24 * 60 * 60, // 30 days (how long a session can last overall)
+    updateAge: 24 * 60 * 60, // 24 hours (how often to refresh the expiry)
+    freshAge: 60 * 60, // 1 hour (or set to 0 to disable completely)
   },
   account: {
     accountLinking: {