feat: implement real-time text-to-speech highlighting and document management within chat interface

feat: implement backend configuration, dynamic frontend API routing, and core React application structure with modular components

feat: implement ChatWindow component with document upload, voice transcription, and streaming responses

feat: implement premium dark mode theme and Sidebar component structure

feat: implement Midnight Amethyst theme, ChatWindow UI component, and backend entry point

fix: reuse and synchronously unlock single Audio element for mobile TTS compatibility

clean: remove single-document delete option from library view

style: fix mobile header notch overlap and chat bubble citation overflow

chore: add dynamic API base URL and improve backend error handling

style: fix library table actions column overflow on desktop

feat: implement core frontend auth and chat interface components

feat: implement full-stack authentication, chat interface, document management, and voice service integration

feat: initialize chat interface with document RAG, voice-to-text, and real-time streaming capabilities.

feat: initialize main App component and global CSS styles

feat: implement ChatWindow component with document upload, voice transcription, and TTS highlighting support

feat: implement API service layer for backend communication and authentication

feat: add api.js module for backend authentication, document management, chat operations, and media processing

feat: add API service layer and ChatWindow component with document upload and voice processing capabilities

Initial clean commit