feat: add copy button for NIP markdown

- Add copy button to WindowToolbar for regular NIPs (appId: "nip")
  - Button appears in window toolbar next to edit button
  - Uses Copy/CopyCheck icons from lucide-react
  - Fetches NIP content via useNip hook
  - Shows toast notification on successful copy

- Add copy button to CommunityNIPDetailRenderer for community NIPs (kind 30817)
  - Button appears in header next to title
  - Copies event.content (markdown) to clipboard
  - Uses same Copy/CopyCheck icon pattern
  - Shows toast notification on successful copy

Both implementations use the existing useCopy hook for state management
and maintain consistent styling with other toolbar buttons.

src/components/WindowToolbar.tsx

@@ -1,4 +1,4 @@
-import { X, Pencil, MoreVertical, WandSparkles } from "lucide-react";
+import { X, Pencil, MoreVertical, WandSparkles, Copy, CopyCheck } from "lucide-react";
 import { useSetAtom } from "jotai";
 import { useState } from "react";
 import { WindowInstance } from "@/types/app";
@@ -13,6 +13,8 @@ import {
 import { SpellDialog } from "@/components/nostr/SpellDialog";
 import { reconstructCommand as reconstructReqCommand } from "@/lib/spell-conversion";
 import { toast } from "sonner";
+import { useCopy } from "@/hooks/useCopy";
+import { useNip } from "@/hooks/useNip";
 
 interface WindowToolbarProps {
   window?: WindowInstance;
@@ -58,6 +60,22 @@ export function WindowToolbar({
     setShowSpellDialog(true);
   };
 
+  // Copy functionality for NIPs
+  const { copy, copied } = useCopy();
+  const isNipWindow = window?.appId === "nip";
+
+  // Fetch NIP content for regular NIPs
+  const { content: nipContent } = useNip(
+    isNipWindow && window?.props?.number ? window.props.number : ""
+  );
+
+  const handleCopyNip = () => {
+    if (!window || !nipContent) return;
+
+    copy(nipContent);
+    toast.success("NIP markdown copied to clipboard");
+  };
+
   // Check if this is a REQ window for spell creation
   const isReqWindow = window?.appId === "req";
 
@@ -88,6 +106,23 @@ export function WindowToolbar({
             <Pencil className="size-4" />
           </button>
 
+          {/* Copy button for NIPs */}
+          {isNipWindow && (
+            <button
+              className="p-1 rounded text-muted-foreground hover:text-foreground hover:bg-muted/50 transition-colors"
+              onClick={handleCopyNip}
+              title="Copy NIP markdown"
+              aria-label="Copy NIP markdown"
+              disabled={!nipContent}
+            >
+              {copied ? (
+                <CopyCheck className="size-4" />
+              ) : (
+                <Copy className="size-4" />
+              )}
+            </button>
+          )}
+
           {/* More actions menu - only for REQ windows for now */}
           {isReqWindow && (
             <DropdownMenu>

src/components/nostr/kinds/CommunityNIPDetailRenderer.tsx

@@ -1,7 +1,10 @@
 import { useMemo } from "react";
+import { Copy, CopyCheck } from "lucide-react";
 import { getTagValue } from "applesauce-core/helpers";
 import { UserName } from "../UserName";
 import { MarkdownContent } from "../MarkdownContent";
+import { useCopy } from "@/hooks/useCopy";
+import { toast } from "sonner";
 import type { NostrEvent } from "@/types/nostr";
 
 /**
@@ -29,12 +32,33 @@ export function CommunityNIPDetailRenderer({ event }: { event: NostrEvent }) {
     },
   );
 
+  // Copy functionality
+  const { copy, copied } = useCopy();
+  const handleCopy = () => {
+    copy(event.content);
+    toast.success("Community NIP markdown copied to clipboard");
+  };
+
   return (
     <div dir="auto" className="flex flex-col gap-6 p-6 max-w-3xl mx-auto">
       {/* NIP Header */}
       <header className="flex flex-col gap-4 border-b border-border pb-6">
-        {/* Title */}
-        <h1 className="text-3xl font-bold">{title}</h1>
+        {/* Title with Copy Button */}
+        <div className="flex items-start justify-between gap-4">
+          <h1 className="text-3xl font-bold">{title}</h1>
+          <button
+            onClick={handleCopy}
+            className="p-2 rounded text-muted-foreground hover:text-foreground hover:bg-muted/50 transition-colors shrink-0"
+            title="Copy NIP markdown"
+            aria-label="Copy NIP markdown"
+          >
+            {copied ? (
+              <CopyCheck className="size-5" />
+            ) : (
+              <Copy className="size-5" />
+            )}
+          </button>
+        </div>
 
         {/* Metadata */}
         <div className="flex items-center gap-4 text-sm text-muted-foreground">