fix(plating): tree-editor back button honours part-scoped context

When the Recipe Tree Editor is opened from the part-scoped Process
Composer (Sub 3), the composer already passes part_id via the
action context. The editor was ignoring it and routing onBackToList
to the generic Recipes list, stranding the user away from the part
they came from.

Capture ctx.part_id at onMounted, expose a state.fromPart flag, and
branch onBackToList: if part_id is set, open the fp.part.catalog
form; otherwise keep the current Recipes-list behaviour. XML button
label flips "Recipes" → "Part" accordingly so the user knows where
the button will take them.

fusion_plating → 19.0.6.1.0

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

fusion_plating/fusion_plating/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating',
-    'version': '19.0.6.0.0',
+    'version': '19.0.6.1.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Core plating / metal finishing ERP: facilities, processes, tanks, baths, jobs, operators.',
     'description': """