feat: UX redesign — Krug trunk test + flow psychology

fix: embed logo as base64 data URI (Gradio 5.x file/ path broken)

style: add logo to header top-left

style: full-width layout + higher contrast on buttons, inputs, and text

style: widen container from 960px to 1280px

redesign: Doctrine.fr-inspired theme — navy blue palette, Inter font, clean layout

fix: center layout — add margin:0 auto + responsive padding to .gradio-container

fix: date filter was filtering all results — ms timestamps parsed incorrectly (app.py)

feat: initial enirtcod.fr MVP deployment