fix(process-tree): breadcrumb pile-up + dead "No MO selected" banner

Two issues on the Process Tree client action:

1. Back to Work Order kept growing breadcrumbs (WO -> Tree -> WO ->
   Tree -> ...) because onBack used action.doAction() which PUSHES
   a new act_window onto the stack instead of popping. Fixed by
   trying action.restore() first (pops the Tree off the stack and
   returns to the parent WO/Step controller). Falls through to
   explicit doAction only when there's no parent in the stack
   (direct URL access).

2. The empty-state banner referenced productionId, a dead variable
   from the bridge_mrp era when the tree was tied to mrp.production.
   Since the component now uses jobId (fp.job context key), the
   "No manufacturing order selected" message ALWAYS fired regardless
   of whether a job was loaded. Fixed by using jobId and updating
   the message to "No work order selected".

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

fusion_plating/fusion_plating_shopfloor/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating — Shop Floor',
-    'version': '19.0.25.2.0',
+    'version': '19.0.25.2.1',
     'category': 'Manufacturing/Plating',
     'summary': 'Shop-floor tablet stations, QR scanning, bake window enforcer, '
                'first-piece inspection gates.',

fusion_plating/fusion_plating_shopfloor/static/src/js/process_tree.js

@@ -131,6 +131,19 @@ export class ProcessTree extends Component {
     }
 
     onBack() {
+        // Try action.restore() first — that pops the Process Tree
+        // off the breadcrumb stack and returns the user to the WO
+        // (or Step) they came from. Without this, doAction pushes a
+        // NEW act_window each time and the breadcrumb keeps growing
+        // (WO → Tree → WO → Tree → ...).
+        try {
+            this.action.restore();
+            return;
+        } catch (e) {
+            // No parent in the stack (user opened Process Tree by
+            // URL or as the first action). Fall through to explicit
+            // navigation.
+        }
         const stepId = this.backStepId;
         if (stepId) {
             this.action.doAction({

fusion_plating/fusion_plating_shopfloor/static/src/xml/process_tree.xml

@@ -119,14 +119,14 @@
 
             <!-- ========== EMPTY ========== -->
             <div class="o_fp_pt_empty"
-                 t-if="!state.loading and !productionId">
+                 t-if="!state.loading and !jobId">
                 <i class="fa fa-exclamation-triangle"/>
-                <div>No manufacturing order selected.</div>
+                <div>No work order selected.</div>
             </div>
             <div class="o_fp_pt_empty"
-                 t-if="!state.loading and productionId and !state.root">
+                 t-if="!state.loading and jobId and !state.root">
                 <i class="fa fa-sitemap"/>
-                <div>No process steps for this order.</div>
+                <div>No process steps for this work order.</div>
             </div>
 
             <!-- ========== TREE ========== -->