[IMP] estate: enhance invoice creation and update Kanban view

- Added functionality to create a customer invoice when a property is marked as
 'Sold'.
- Set `partner_id` from the estate property and invoice type to 'Customer
  Invoice'.
- Included two invoice lines: 6% of selling price and an additional 100.00 in
  fees.
- Enhanced Kanban view to display expected price, best price, selling price, and
  tags.
- Applied conditional logic and default grouping by property type; disabled
  drag-and-drop.

estate/views/estate_property_views.xml

@@ -10,17 +10,40 @@
         <field name="name">estate.property.kanban</field>
         <field name="model">estate.property</field>
         <field name="arch" type="xml">
-            <kanban>
+            <kanban
+                default_group_by="property_type_id"
+                records_draggable='False'>
+                <field name="property_type_id"/>
+                <field name="state"/>
+                <field name="best_price"/>
+                <field name="selling_price"/>
+                <field name="expected_price"/>
                 <templates>
                     <t t-name="kanban-box">
-                        <div class="oe_kanban_global_click">
-                            <field name="name" />
+                        <div class="oe_kanban_global_click oe_kanban_card">
+                            <div class="oe_kanban_title">
+                                <strong><field name="name" /></strong>
+                            </div>
+                            <div class="oe_kanban_prices">
+                                <div t-if="record.state.raw_value == 'offer_received'" class="oe_kanban_best_price">
+                                    <strong>Best Price:</strong> <field name="best_price" />
+                                </div>
+                                <div t-if="record.state.raw_value == 'offer_accepted'" class="oe_kanban_selling_price">
+                                    <strong>Selling Price:</strong> <field name="selling_price" />
+                                </div>
+                                <div class="oe_kanban_expected_price">
+                                    <strong>Expected Price:</strong> <field name="expected_price" />
+                                </div>
+                            </div>
+                            <div class="oe_kanban_tags">
+                                <field name="tag_ids" widget="many2many_tags" />
+                            </div>
                         </div>
                     </t>
                 </templates>
             </kanban>
         </field>
-    </record>
+    </record>    
     <record id="estate_property_list" model="ir.ui.view">
         <field name="name">estate.property.list</field>
         <field name="model">estate.property</field>