feat: customizable portal gradient theme + LTC repair form fixes

- Add portal gradient branding settings with 4 presets (Green/Teal,
  Blue/Purple, Sunset Orange, Dark Slate) and custom color picker
- Live preview in settings, onchange updates colors reactively
- Dynamic gradient applied across portal home, CSS, and card elements
- Fix after photos visibility (conditional on resolved=yes)
- Fix technician section gating on portal repair form
- Move Create Sale Order button to form header for visibility
- Fix portal home row width inconsistency (xpath target change)

Co-authored-by: Cursor <cursoragent@cursor.com>

fusion_claims/views/ltc_repair_views.xml

@@ -10,6 +10,9 @@
         <field name="arch" type="xml">
             <form string="Repair Request">
                 <header>
+                    <button name="action_create_sale_order" type="object"
+                            string="Create Sale Order" class="btn-primary"
+                            invisible="sale_order_id"/>
                     <field name="stage_id" widget="statusbar"
                            options="{'clickable': '1'}"/>
                 </header>
@@ -98,9 +101,6 @@
                                     <field name="repair_value"/>
                                 </group>
                             </group>
-                            <button name="action_create_sale_order" type="object"
-                                    string="Create Sale Order" class="btn-primary"
-                                    invisible="sale_order_id"/>
                         </page>
 
                         <page string="Photos &amp; Notes" name="photos">