feat: add Microsoft Word (.docx/.doc) document parsing alongside PDF and TXT

feat: upgrade Light and Dark themes with bold SaaS executive glass borders and depth-scaled 3D particle animations

feat: add Google Stitch Aurora Light and Obsidian Dark theme switcher button with persistence

feat: integrate Google Stitch MCP Obsidian Prism design tokens into 3D animated studio frontend

feat: upgrade to 3D animated studio frontend with interactive particle canvas and 3D tilt cards

feat: add interactive web UI dashboard and PDF upload screen (Task #3)