fix: Critical button styling and tree view translations

🚨 Critical Fixes:

1. **Fixed Missing Button Styling:**
   - button_approve → btn-primary + fa-check-circle (was oe_highlight)
   - open_convert_po_contract → btn-info + fa-file-contract (was oe_highlight)

   ⚠️ These buttons were showing with transparent background due to oe_highlight class

2. **Fixed Tree View Column Headers Translation:**
   - Purchase State → حالة الشراء
   - State → الحالة
   - Categories → الفئات
   - Branch → الفرع
   - Department → القسم
   - Employee → الموظف
   - Date → التاريخ
   - Request Number → رقم الطلب
   - Approve Order → موافقة الطلب
   - PO To Contract → تحويل إلى عقد

✅ Root Cause Analysis:
- oe_highlight class doesn't provide background color in some Odoo themes
- Missing Arabic translations for tree view column headers
- These were the last remaining unstyled buttons

🎯 Impact:
- All buttons now have proper background colors
- Tree view fully translated to Arabic
- Professional UI consistency achieved

odex25_purchase/purchase_requisition_custom/i18n/ar_001.po

@@ -3021,6 +3021,56 @@ msgstr "تم التسليم"
 msgid "Create Asset Custody"
 msgstr "إنشاء عهدة أصول"
 
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_request_tree
+msgid "Purchase State"
+msgstr "حالة الشراء"
+
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_request_tree
+msgid "State"
+msgstr "الحالة"
+
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_request_tree
+msgid "Categories"
+msgstr "الفئات"
+
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_request_tree
+msgid "Branch"
+msgstr "الفرع"
+
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_request_tree
+msgid "Department"
+msgstr "القسم"
+
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_request_tree
+msgid "Employee"
+msgstr "الموظف"
+
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_request_tree
+msgid "Date"
+msgstr "التاريخ"
+
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_request_tree
+msgid "Request Number"
+msgstr "رقم الطلب"
+
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_requisition_custom_form_view
+msgid "Approve Order"
+msgstr "موافقة الطلب"
+
+#. module: purchase_requisition_custom
+#: model_terms:ir.ui.view,arch_db:purchase_requisition_custom.purchase_requisition_custom_form_view
+msgid "PO To Contract"
+msgstr "تحويل إلى عقد"
+
 #. module: vendor_evaluation
 #: model_terms:ir.ui.view,arch_db:vendor_evaluation.vendor_evaluation_wizard_view
 msgid "Evaluate"

odex25_purchase/purchase_requisition_custom/views/purchase_requisition_custom.xml

@@ -210,12 +210,12 @@
                 <xpath expr="//button[@name='button_approve']" position="replace">
                     <button name="button_approve" type="object"
                             attrs="{'invisible':['|',('requisition_id','!=',False),('state','not in',('to approve'))]}"
-                            string="Approve Order" class="oe_highlight" groups="purchase.group_purchase_manager"/>
+                            string="Approve Order" class="btn-primary" groups="purchase.group_purchase_manager" icon="fa-check-circle"/>
                 </xpath>
                 <xpath expr="//button[@name='button_draft']" position="after">
 
                     <button string='PO To Contract' name="open_convert_po_contract" type="object"
-                            class="oe_highlight" groups="purchase.group_purchase_manager"
+                            class="btn-info" groups="purchase.group_purchase_manager" icon="fa-file-contract"
                             attrs="{'invisible':[('state','in',('draft','wait','wait_for_send','sent','to approve','sign','waiting','purchase','cancel'))]}"/>
                 </xpath>
                 <xpath expr="//button[@name='button_draft']" position="attributes">