Initial release: JMAP Webmail Client

A modern, privacy-focused webmail client built with Next.js and the JMAP protocol.
Designed for Stalwart Mail Server.

Features:
- Full email operations (compose, reply, forward, threading)
- Real-time push notifications
- Dark/light theme support
- Mobile responsive design
- Keyboard shortcuts
- Drag-and-drop organization
- i18n (English/French)
- Security-first (external content blocked, HTML sanitization)

components/ui/button.tsx

@@ -0,0 +1,43 @@
+import * as React from "react";
+import { cn } from "@/lib/utils";
+
+export interface ButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+  variant?: "default" | "ghost" | "outline" | "destructive";
+  size?: "sm" | "md" | "lg" | "icon";
+}
+
+const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant = "default", size = "md", ...props }, ref) => {
+    return (
+      <button
+        className={cn(
+          "inline-flex items-center justify-center rounded-md font-medium transition-all duration-200",
+          "focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background",
+          "disabled:pointer-events-none disabled:opacity-50",
+          {
+            default:
+              "bg-primary text-primary-foreground hover:bg-primary/90 shadow-sm hover:shadow",
+            ghost: "hover:bg-accent hover:text-accent-foreground",
+            outline:
+              "border border-input bg-background hover:bg-accent hover:text-accent-foreground",
+            destructive:
+              "bg-destructive text-destructive-foreground hover:bg-destructive/90 shadow-sm",
+          }[variant],
+          {
+            sm: "h-9 px-3 text-sm",
+            md: "h-10 px-4 py-2",
+            lg: "h-11 px-8",
+            icon: "h-10 w-10",
+          }[size],
+          className
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  }
+);
+Button.displayName = "Button";
+
+export { Button };