Migrate views to Odoo 17/18 syntax; fix pre-existing XML blockers

- Convert all 124 attrs="{...}" across 13 view files to direct Odoo 17/18
  attributes (invisible/readonly/required with Python expressions); prefix-domain
  OR/AND/NOT and operators handled (e.g. "(is_overdue or days_until_due > 7) and completed")
- Fix pre-existing XML errors that blocked module load on any version:
  - Replace invalid   HTML entity with   in 4 files (reports + portal)
  - Merge duplicate style= attributes (3 spots in website_intake_templates)
  - Replace 3 illegal <t t-if> embedded in class="" attributes with t-attf-class
- All 44 module XML files now parse clean

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

activeblue_familylaw/views/fl_child_views.xml

@@ -8,7 +8,7 @@
             <field name="arch" type="xml">
                 <form string="Child">
                     <div class="alert alert-warning" role="alert"
-                         attrs="{'invisible': [('approaching_emancipation', '=', False)]}">
+                         invisible="not approaching_emancipation">
                         <strong>⚠️ APPROACHING EMANCIPATION:</strong>
                         <field name="name" readonly="1"/> turns 18 in
                         <field name="days_until_emancipation" readonly="1"/> days