fix: restore complete source code and fix launchers

- Copy complete source code packages from original CodeNomad project
- Add root package.json with npm workspace configuration
- Include electron-app, server, ui, tauri-app, and opencode-config packages
- Fix Launch-Windows.bat and Launch-Dev-Windows.bat to work with correct npm scripts
- Fix Launch-Unix.sh to work with correct npm scripts
- Launchers now correctly call npm run dev:electron which launches Electron app

packages/ui/src/components/message-preview.tsx

@@ -0,0 +1,32 @@
+import type { Component } from "solid-js"
+import MessageBlock from "./message-block"
+import type { InstanceMessageStore } from "../stores/message-v2/instance-store"
+
+interface MessagePreviewProps {
+  instanceId: string
+  sessionId: string
+  messageId: string
+  store: () => InstanceMessageStore
+}
+
+const MessagePreview: Component<MessagePreviewProps> = (props) => {
+  const lastAssistantIndex = () => 0
+
+  return (
+    <div class="message-preview message-stream">
+      <MessageBlock
+        messageId={props.messageId}
+        instanceId={props.instanceId}
+        sessionId={props.sessionId}
+        store={props.store}
+        messageIndex={0}
+        lastAssistantIndex={lastAssistantIndex}
+        showThinking={() => false}
+        thinkingDefaultExpanded={() => false}
+        showUsageMetrics={() => false}
+      />
+    </div>
+  )
+}
+
+export default MessagePreview