tab title -> Visual Tree

tooltip: left of cursor + add mean attention; rename to Visual Tree

use latest gradio (6.19) compatible with py3.13 env; sdk_version match

re-add gradio==4.44.1 (was uninstalled); align sdk_version

deps: drop gradio from requirements (let SDK manage), CPU torch, transformers>=4.53; add startup prints

fix Space startup: lazy model load + module-level launch (no __main__ guard)

add .gitignore, drop __pycache__

DINO Hierarchies Gradio app: upload image -> condensed tree + reveal