fusion_plating_shopfloor: card styling fix + drag & drop between work centres (v19.0.1.1.0)

Cards now have visible borders and elevation shadow in both light/dark
mode. Column count badge restored to high-contrast white-on-gray.

Added HTML5 drag & drop: users can drag work order cards between work
centre columns. Backend endpoint writes workcenter_id on mrp.workorder.
Drop target columns highlight with the action colour.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

fusion-plating/fusion_plating_shopfloor/controllers/shopfloor_controller.py

@@ -343,6 +343,46 @@ class FpShopfloorController(http.Controller):
     # ==================================================================
     # Plant Overview Dashboard
     # ==================================================================
+
+    @http.route('/fp/shopfloor/plant_overview/move_card',
+                type='jsonrpc', auth='user')
+    def plant_overview_move_card(self, card_id, source_model,
+                                target_workcenter_id):
+        """Move a work order card to a different work centre (drag & drop).
+
+        Only mrp.workorder is supported for now — other source models
+        will return an error so the frontend can display it gracefully.
+        """
+        if source_model != 'mrp.workorder':
+            return {'ok': False,
+                    'error': 'Drag & drop is only supported for work orders.'}
+
+        MrpWO = request.env.get('mrp.workorder')
+        if MrpWO is None:
+            return {'ok': False, 'error': 'MRP module not available.'}
+
+        wo = MrpWO.browse(int(card_id))
+        if not wo.exists():
+            return {'ok': False, 'error': f'Work order {card_id} not found.'}
+
+        wc = request.env['mrp.workcenter'].browse(int(target_workcenter_id))
+        if not wc.exists():
+            return {'ok': False,
+                    'error': f'Work centre {target_workcenter_id} not found.'}
+
+        try:
+            wo.write({'workcenter_id': wc.id})
+            _logger.info(
+                'Plant Overview: moved WO %s (%s) → WC %s (%s) by uid %s',
+                wo.id, wo.display_name, wc.id, wc.name,
+                request.env.uid,
+            )
+        except Exception as exc:
+            _logger.exception('Plant Overview move_card failed')
+            return {'ok': False, 'error': str(exc)}
+
+        return {'ok': True}
+
     @http.route('/fp/shopfloor/plant_overview', type='jsonrpc', auth='user')
     def plant_overview(self, facility_id=None, search=None):
         """Return work orders grouped by work centre for the plant overview.