feat(fusion_plating_jobs): Open Workspace smart button on fp.job form

Plan task P1.16. Header button on the fp.job form that opens the
JobWorkspace OWL client action focused on the current WO. Primary
entry point for techs before the Landing kanban (Phase 3) ships;
remains as a back-office shortcut after.

Hidden when state == 'draft' (no steps to work yet).

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

fusion_plating/fusion_plating_jobs/models/fp_job.py

@@ -576,6 +576,22 @@ class FpJob(models.Model):
             'context': {'default_job_id': self.id},
         }
 
+    def action_open_workspace(self):
+        """Open the JobWorkspace OWL client action focused on this job.
+
+        Spec: 2026-05-22-shopfloor-tablet-redesign — Phase 1 deliverable.
+        Used as the smart-button entry point before the Landing kanban
+        (Phase 3) is shipped, and stays as a back-office shortcut after.
+        """
+        self.ensure_one()
+        return {
+            'type': 'ir.actions.client',
+            'tag': 'fp_job_workspace',
+            'name': self.display_wo_name or self.name,
+            'params': {'job_id': self.id},
+            'target': 'current',
+        }
+
     def action_finish_current_step(self):
         """Steelhead-style header button: finish whatever's currently
         in_progress and auto-start the next pending/ready step. If

fusion_plating/fusion_plating_jobs/views/fp_job_form_inherit.xml

@@ -20,6 +20,15 @@
         <field name="inherit_id" ref="fusion_plating.view_fp_job_form"/>
         <field name="arch" type="xml">
             <xpath expr="//header" position="inside">
+                <!-- Phase 1 — Tablet redesign. Opens the JobWorkspace OWL
+                     client action focused on this WO. Primary entry point
+                     for techs before the Landing kanban (Phase 3) ships;
+                     stays as a back-office shortcut after. -->
+                <button name="action_open_workspace" type="object"
+                        string="Open Workspace"
+                        class="btn-primary"
+                        icon="fa-tablet"
+                        invisible="state == 'draft'"/>
                 <button name="action_open_process_tree" type="object"
                         string="Process Tree"
                         class="btn-secondary"