fix(gui+api): cleanup before merge

- Rename "TrovaUtensile" tab → "Cerca modello".
- Remove the "Precisione (ultime 5 detection)" stats panel and the
  "Dettagli" JSON dump from the grasp tab; keep hidden stubs so the
  existing app.js continuous-loop code doesn't null-deref.
- Add work_plane_routes to api/__init__.py imports + __all__ (consistency
  with the other routers).
- Trim the misleading "drag = pan · wheel = zoom · doppio click = reset"
  hint from the Calibrazione Piano RGB label — pan/zoom isn't wired.
- Disable wpClearBtn initially so it doesn't flash clickable before
  fetchSaved() resolves.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/presa_mano/api/__init__.py

@@ -11,6 +11,7 @@ from . import (
     perception_routes,
     posture_routes,
     robot_routes,
+    work_plane_routes,
     wrist_routes,
 )
 
@@ -23,5 +24,6 @@ __all__ = [
     "perception_routes",
     "posture_routes",
     "robot_routes",
+    "work_plane_routes",
     "wrist_routes",
 ]