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)

contexts/drag-drop-context.tsx

@@ -0,0 +1,56 @@
+"use client";
+
+import { createContext, useContext, useState, useCallback, ReactNode } from "react";
+import { Email } from "@/lib/jmap/types";
+
+interface DragDropState {
+  isDragging: boolean;
+  draggedEmails: Email[];
+  dragCount: number;
+  sourceMailboxId: string | null;
+}
+
+interface DragDropContextValue extends DragDropState {
+  startDrag: (emails: Email[], sourceMailboxId: string) => void;
+  endDrag: () => void;
+}
+
+const initialState: DragDropState = {
+  isDragging: false,
+  draggedEmails: [],
+  dragCount: 0,
+  sourceMailboxId: null,
+};
+
+const DragDropContext = createContext<DragDropContextValue | null>(null);
+
+export function DragDropProvider({ children }: { children: ReactNode }) {
+  const [state, setState] = useState<DragDropState>(initialState);
+
+  const startDrag = useCallback((emails: Email[], sourceMailboxId: string) => {
+    setState({
+      isDragging: true,
+      draggedEmails: emails,
+      dragCount: emails.length,
+      sourceMailboxId,
+    });
+  }, []);
+
+  const endDrag = useCallback(() => {
+    setState(initialState);
+  }, []);
+
+  return (
+    <DragDropContext.Provider value={{ ...state, startDrag, endDrag }}>
+      {children}
+    </DragDropContext.Provider>
+  );
+}
+
+export function useDragDropContext() {
+  const context = useContext(DragDropContext);
+  if (!context) {
+    throw new Error("useDragDropContext must be used within DragDropProvider");
+  }
+  return context;
+}