refactor: create IconCopyButton component and use CopyCheck consistently

- Add IconCopyButton component for reusable icon-only copy buttons
- Refactor RepositoryFilesSection to use IconCopyButton
- Replace Check with CopyCheck in ChatMessageContextMenu
- Replace Check with CopyCheck in BaseEventRenderer
- Use text-success instead of text-green-500 for consistency

src/components/chat/ChatMessageContextMenu.tsx

@@ -12,7 +12,7 @@ import {
 } from "@/components/ui/context-menu";
 import {
   Copy,
-  Check,
+  CopyCheck,
   FileJson,
   ExternalLink,
   Reply,
@@ -212,7 +212,7 @@ export function ChatMessageContextMenu({
           </ContextMenuItem>
           <ContextMenuItem onClick={copyEventId}>
             {copied ? (
-              <Check className="size-4 mr-2 text-green-500" />
+              <CopyCheck className="size-4 mr-2 text-success" />
             ) : (
               <Copy className="size-4 mr-2" />
             )}

src/components/nostr/kinds/BaseEventRenderer.tsx

@@ -18,7 +18,7 @@ import {
 import {
   Menu,
   Copy,
-  Check,
+  CopyCheck,
   FileJson,
   ExternalLink,
   Zap,
@@ -267,7 +267,7 @@ export function EventMenu({
         <DropdownMenuSeparator />
         <DropdownMenuItem onClick={copyEventId}>
           {copied ? (
-            <Check className="size-4 mr-2 text-green-500" />
+            <CopyCheck className="size-4 mr-2 text-success" />
           ) : (
             <Copy className="size-4 mr-2" />
           )}
@@ -433,7 +433,7 @@ export function EventContextMenu({
         <ContextMenuSeparator />
         <ContextMenuItem onClick={copyEventId}>
           {copied ? (
-            <Check className="size-4 mr-2 text-green-500" />
+            <CopyCheck className="size-4 mr-2 text-success" />
           ) : (
             <Copy className="size-4 mr-2" />
           )}

src/components/nostr/kinds/RepositoryFilesSection.tsx

@@ -1,16 +1,9 @@
 import { useState } from "react";
-import {
-  FolderGit2,
-  AlertCircle,
-  FileQuestion,
-  Binary,
-  Copy,
-  Check,
-} from "lucide-react";
+import { FolderGit2, AlertCircle, FileQuestion, Binary } from "lucide-react";
 import { useGitTree } from "@/hooks/useGitTree";
 import { useGitBlob } from "@/hooks/useGitBlob";
-import { useCopy } from "@/hooks/useCopy";
 import { FileTreeView } from "@/components/ui/FileTreeView";
+import { IconCopyButton } from "@/components/ui/IconCopyButton";
 import { SyntaxHighlight } from "@/components/SyntaxHighlight";
 import { Skeleton } from "@/components/ui/skeleton/Skeleton";
 import { cn } from "@/lib/utils";
@@ -79,9 +72,6 @@ export function RepositoryFilesSection({
     ? getExtension(selectedFile.name) || null
     : null;
 
-  // Copy functionality for file content
-  const { copy, copied } = useCopy();
-
   const handleFileSelect = (file: SelectedFile) => {
     setSelectedFile(file);
   };
@@ -185,18 +175,11 @@ export function RepositoryFilesSection({
                     <span className="text-xs font-mono text-muted-foreground truncate">
                       {selectedFile.path}
                     </span>
-                    <button
-                      type="button"
-                      onClick={() => copy(fileContent)}
-                      className="flex-shrink-0 p-1 rounded hover:bg-muted/50 text-muted-foreground hover:text-foreground transition-colors"
-                      title="Copy file content"
-                    >
-                      {copied ? (
-                        <Check className="size-3.5 text-success" />
-                      ) : (
-                        <Copy className="size-3.5" />
-                      )}
-                    </button>
+                    <IconCopyButton
+                      text={fileContent}
+                      size="sm"
+                      label="Copy file content"
+                    />
                   </div>
                   {rawContent && (
                     <span className="text-xs text-muted-foreground flex-shrink-0">

src/components/ui/IconCopyButton.tsx

@@ -0,0 +1,55 @@
+import { Copy, CopyCheck } from "lucide-react";
+import { useCopy } from "@/hooks/useCopy";
+import { cn } from "@/lib/utils";
+
+type IconSize = "xs" | "sm" | "md" | "lg";
+
+interface IconCopyButtonProps {
+  /** Text to copy to clipboard */
+  text: string;
+  /** Icon size preset */
+  size?: IconSize;
+  /** Additional class names for the button */
+  className?: string;
+  /** Tooltip/aria-label text */
+  label?: string;
+}
+
+const sizeClasses: Record<IconSize, string> = {
+  xs: "size-3",
+  sm: "size-3.5",
+  md: "size-4",
+  lg: "size-5 md:size-4",
+};
+
+/**
+ * Tiny icon-only copy button for inline use
+ * Uses Copy/CopyCheck icons with consistent styling
+ */
+export function IconCopyButton({
+  text,
+  size = "sm",
+  className,
+  label = "Copy",
+}: IconCopyButtonProps) {
+  const { copy, copied } = useCopy();
+
+  return (
+    <button
+      type="button"
+      onClick={() => copy(text)}
+      className={cn(
+        "flex-shrink-0 p-1 rounded hover:bg-muted/50 text-muted-foreground hover:text-foreground transition-colors",
+        className,
+      )}
+      title={label}
+      aria-label={label}
+    >
+      {copied ? (
+        <CopyCheck className={cn(sizeClasses[size], "text-success")} />
+      ) : (
+        <Copy className={sizeClasses[size]} />
+      )}
+    </button>
+  );
+}