feat(sub12a): recipe form — buttons + is_template + Step Authoring tab

Process node form:
- Header: keep 'Open Tree Editor' (primary, existing); add 'Open Simple
  Editor' (secondary). Both visible only for recipe-type nodes.
- Recipe Settings group: add preferred_editor + is_template (the latter
  supervisor-only).
- New 'Step Authoring' notebook page (visible for step/operation):
  Stations, default_kind, material_callout, predecessor/rack/transition
  flags, time/temp targets, voltage/viscosity, readonly
  source_template_id.

Model:
- New action_open_simple_editor (sibling of action_open_tree_editor).
- New _resolve_preferred_editor() — per-recipe preferred_editor wins,
  'auto' falls back to company.x_fc_default_recipe_editor, final
  fallback 'tree'.
- New action_open_recipe_with_preferred_editor() — one-click route
  through the resolver. Reserved for menu-list / context-menu callers
  that want the simple-loving foreman path.

Tree editor + every existing battle test path untouched.

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

fusion_plating/fusion_plating/models/fp_process_node.py

@@ -544,6 +544,41 @@ class FpProcessNode(models.Model):
             'context': {'recipe_id': root.id},
         }
 
+    def action_open_simple_editor(self):
+        """Open the OWL Simple Recipe Editor for this recipe (Sub 12a)."""
+        self.ensure_one()
+        root = self if self.node_type == 'recipe' else self.recipe_root_id
+        return {
+            'type': 'ir.actions.client',
+            'tag': 'fp_simple_recipe_editor',
+            'name': f'Recipe — {root.name}',
+            'context': {'recipe_id': root.id},
+        }
+
+    def _resolve_preferred_editor(self):
+        """Returns 'tree' or 'simple' for this recipe.
+
+        Per-recipe preferred_editor wins. 'auto' falls back to the
+        company-level default. 'tree' is the final fallback.
+        """
+        self.ensure_one()
+        if self.preferred_editor in ('tree', 'simple'):
+            return self.preferred_editor
+        return self.env.company.x_fc_default_recipe_editor or 'tree'
+
+    def action_open_recipe_with_preferred_editor(self):
+        """Routes to whichever editor the recipe (or company) prefers.
+
+        Used by menu actions / context-menu opens — gives the
+        simple-loving foreman a one-click path that respects their
+        preference without forcing a tree-loving engineer to pick
+        between two buttons every time.
+        """
+        self.ensure_one()
+        if self._resolve_preferred_editor() == 'simple':
+            return self.action_open_simple_editor()
+        return self.action_open_tree_editor()
+
     # ---- Copy (deep-duplicate) -----------------------------------------------
 
     def copy(self, default=None):