Fix hardcoded server name in Commands slash command invocation

The command invocation used "gcontext" instead of the dynamic server
name from /api/project, so copied slash commands were wrong for
non-default instance names.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/src/Commands.jsx

@@ -1,12 +1,12 @@
 import React, { useEffect, useState } from "react";
-import { getJSON, fileRef } from "./lib.js";
+import { getJSON, fileRef, commandInvocation } from "./lib.js";
 import { C, mono, Chip, cardBase, cardHover, pageTitle, sectionLabel, EmptyState, useHover } from "./ui.jsx";
 import CopyPrompt from "./Copy.jsx";
 
 // Commands = files under connections/*/commands/ and modules/*/commands/,
 // registered as MCP prompts. In Claude Code each one is a slash command.
 
-const invocationFor = (name) => `/mcp__gcontext__${name}`;
+const invocationFor = (name) => commandInvocation(name);
 
 function CommandCard({ cmd }) {
   const [h, hp] = useHover();

web/src/lib.js

@@ -30,6 +30,7 @@ export const setServerName = (name) => { if (name) serverName = name; };
 export const fileRef = (path) => `@${serverName}:gcontext://${path}`;
 export const folderRef = (path) => `@${serverName}:gcontext://${path.replace(/\/$/, "")}/`;
 export const refPrompt = (path, isDir) => (isDir ? folderRef(path) : fileRef(path));
+export const commandInvocation = (name) => `/mcp__${serverName}__${name}`;
 
 // File-card label: "notes.md" -> "md", extensionless -> "file". Dotfiles (".env")
 // stay "file" (lastIndexOf > 0), so the label never repeats the whole name.