New gradient theme: #2e33c5 to #cf2040 across nav, footer, buttons, and all accents

Simplify password eye to single grey icon, move forgot below sign-in, remove or divider

Polish forgot password and password toggle UI to match design system

Add forgot password flow and password visibility toggle

Add detailed error logging to register/login endpoints

Fix: writable data dir for HF Spaces, pin bcrypt 4.0.1

Fix: add checkfirst=True for table creation, use 1 worker

Fix HF metadata: use valid colorTo value

Add Hugging Face Spaces support (Docker, port 7860, non-root user)

Initial commit: SatDetect satellite change detection web app