jacxas/Forge-ai — reverse-engineered prompt

Build me the Forge AI app from this repo. It looks like a TypeScript AI Studio project that uses Gemini, with Firebase related config and a Vercel deploy setup. I want it to run locally and feel like a clean AI assistant experience where a user can type prompts, get helpful AI responses, and keep whatever existing prompt history or saved conversation behavior the code already supports.

Please inspect the existing files, wire up anything unfinished, fix errors, and make the UI usable and polished without adding random features that are not already implied by the project. Use the Gemini API key from .env.local, make sure npm install and npm run dev work, and update any setup notes if something is missing. If you need current Gemini, Firebase, Vite, or Vercel docs, look them up online.