feat: add mcp oauth support via /mcp connect (#570)

src/cli/commands/mcp.ts

@@ -355,7 +355,12 @@ export function handleMcpUsage(ctx: McpCommandContext, msg: string): void {
     ctx.buffersRef,
     ctx.refreshDerived,
     msg,
-    'Usage: /mcp [add ...]\n  /mcp - list MCP servers\n  /mcp add --transport <http|sse|stdio> <name> <url|command> [...] - add a new server\n\nExamples:\n  /mcp add --transport http notion https://mcp.notion.com/mcp\n  /mcp add --transport http api https://api.example.com --header "Authorization: Bearer token"',
+    "Usage: /mcp [subcommand ...]\n" +
+      "  /mcp                  - Open MCP server manager\n" +
+      "  /mcp add ...          - Add a new server (without OAuth)\n" +
+      "  /mcp connect          - Interactive wizard with OAuth support\n\n" +
+      "Examples:\n" +
+      "  /mcp add --transport http notion https://mcp.notion.com/mcp",
     false,
   );
 }

src/cli/commands/registry.ts

@@ -178,7 +178,7 @@ export const commands: Record<string, Command> = {
     },
   },
   "/mcp": {
-    desc: "Manage MCP servers",
+    desc: "Manage MCP servers (add, connect with OAuth)",
     order: 32,
     handler: () => {
       // Handled specially in App.tsx to show MCP server selector