Fix MCP form input and add reactive MCP server state

- Fix space key not working in MCP add form by handling evt.name === "space"
  - Add support for multi-character paste sequences via evt.sequence
  - Add MCPServerDisplay type to types/tui.ts for UI display
  - Add mcpServers reactive state to app store with setMcpServers,
    addMcpServer, and updateMcpServerStatus actions
  - Update session.tsx to use store's mcpServers instead of static props
  - Update execute.tsx to update store when server is added/connected
  - Remove duplicate MCPServer interfaces from app.tsx, session.tsx,
    and mcp-select.tsx in favor of shared MCPServerDisplay type

src/tui-solid/app.tsx

@@ -28,6 +28,7 @@ import { ToastProvider, Toast, useToast } from "@tui-solid/ui/toast";
 import { Home } from "@tui-solid/routes/home";
 import { Session } from "@tui-solid/routes/session";
 import type { TuiInput, TuiOutput } from "@tui-solid/types";
+import type { MCPServerDisplay } from "@/types/tui";
 import type { PermissionScope, LearningScope } from "@/types/tui";
 import type { MCPAddFormData } from "@/types/mcp";
 
@@ -37,13 +38,6 @@ interface AgentOption {
   description?: string;
 }
 
-interface MCPServer {
-  id: string;
-  name: string;
-  status: "connected" | "disconnected" | "error";
-  description?: string;
-}
-
 interface AppProps extends TuiInput {
   onExit: (output: TuiOutput) => void;
   onSubmit: (input: string) => Promise<void>;
@@ -72,7 +66,7 @@ interface AppProps extends TuiInput {
   } | null;
   agents?: AgentOption[];
   currentAgent?: string;
-  mcpServers?: MCPServer[];
+  mcpServers?: MCPServerDisplay[];
   files?: string[];
 }
 
@@ -450,7 +444,7 @@ export interface TuiRenderOptions extends TuiInput {
   } | null;
   agents?: AgentOption[];
   currentAgent?: string;
-  mcpServers?: MCPServer[];
+  mcpServers?: MCPServerDisplay[];
   files?: string[];
 }