Complete UI/UX, Bug Fixes & Deployment Configuration

[AryanPandya0]

Overview

This pull request introduces a massive stabilization and visual overhaul of the CareerForge AI platform, preparing the codebase for Vercel/Render production deployment.

Key Changes

• Deployment Ready: Updated React frontend endpoints to point to the live Render backend. Correctly configured FastAPI CORS payload to accept the Vercel production domain.
• Root Bug Fixes: Permanently resolved all backend Python import errors (ModuleNotFoundError), fixed PDF generation crashing on long AI outputs using multi_cell, and corrected the Gemini model routing.
• Massive UI/UX Upgrade: Implemented a global Light & Dark mode theme utilizing a sleek, professional color palette.
• Native Mobile Experience: Introduced a mobile-first bottom navigation bar and overhauled the Chatbot UI to fill 100dvh (hiding global navs) for a true app-like messaging experience with flawless dynamic auto-scrolling.
• State Persistence: Wired up form data in the Resume Builder, ATS Scanner, and Chatbot to sessionStorage so no progress is lost when navigating between tools.