chore(deps): Update project dependencies and refactor authentication flow

- Upgrade Next.js to version 15.1.7
- Update Drizzle ORM and related dependencies
- Add Nodemailer and related type definitions
- Refactor authentication routes and components
- Modify user schema to include first and last name
- Update authentication configuration and session handling
- Remove deprecated login and register pages
- Restructure authentication-related components and routes

src/components/ui/button.tsx

@@ -5,21 +5,26 @@ import { cva, type VariantProps } from "class-variance-authority"
 import { cn } from "~/lib/utils"
 
 const buttonVariants = cva(
-  "inline-flex items-center justify-center rounded-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:opacity-50 disabled:pointer-events-none ring-offset-background",
+  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0",
   {
     variants: {
       variant: {
-        default: "bg-primary text-primary-foreground hover:bg-primary/90",
-        destructive: "bg-destructive text-destructive-foreground hover:bg-destructive/90",
-        outline: "border border-input hover:bg-accent hover:text-accent-foreground",
-        secondary: "bg-secondary text-secondary-foreground hover:bg-secondary/80",
+        default:
+          "bg-primary text-primary-foreground shadow hover:bg-primary/90",
+        destructive:
+          "bg-destructive text-destructive-foreground shadow-sm hover:bg-destructive/90",
+        outline:
+          "border border-input bg-background shadow-sm hover:bg-accent hover:text-accent-foreground",
+        secondary:
+          "bg-secondary text-secondary-foreground shadow-sm hover:bg-secondary/80",
         ghost: "hover:bg-accent hover:text-accent-foreground",
-        link: "underline-offset-4 hover:underline text-primary",
+        link: "text-primary underline-offset-4 hover:underline",
       },
       size: {
-        default: "h-10 py-2 px-4",
-        sm: "h-9 px-3 rounded-md",
-        lg: "h-11 px-8 rounded-md",
+        default: "h-9 px-4 py-2",
+        sm: "h-8 rounded-md px-3 text-xs",
+        lg: "h-10 rounded-md px-8",
+        icon: "h-9 w-9",
       },
     },
     defaultVariants: {