fix: resolve homepage sections editor and rendering issues

- Fix sections editor not showing by converting isHomepage getter to property
- Add Alpine Collapse plugin for accordion animations
- Fix Quill editor content not syncing after page load
- Add platform dropdown to content page edit form
- Create shared templates config (app/templates_config.py) with i18n globals
  to make _() translation function available in Jinja2 macros
- Fix pricing template field names (monthly_price → price_monthly)
- Fix translation key (pricing.save_20 → pricing.save_months)
- Add tiers context to CMS homepage route for pricing section
- Fix architecture validation issues (language defaults, inline SVGs → $icon)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/templates/platform/homepage-default.html

@@ -22,7 +22,7 @@
 
 {% block content %}
 {# Set up language context #}
-{% set lang = request.state.language or (platform.default_language if platform else 'fr') %}
+{% set lang = request.state.language|default("fr") or (platform.default_language if platform else 'fr') %}
 {% set default_lang = platform.default_language if platform else 'fr' %}
 
 {# ═══════════════════════════════════════════════════════════════════════════ #}

app/templates/platform/sections/_hero.html

@@ -3,8 +3,8 @@
 {#
     Parameters:
     - hero: HeroSection object (or dict)
-    - lang: Current language code (from request.state.language)
-    - default_lang: Fallback language (from platform.default_language)
+    - lang: Current language code (passed from parent template)
+    - default_lang: Fallback language (passed from parent template)
 #}
 
 {% macro render_hero(hero, lang, default_lang) %}

app/templates/platform/sections/_pricing.html

@@ -47,7 +47,7 @@
                 </button>
                 <span :class="!annual ? 'text-gray-400' : 'text-gray-900 dark:text-white font-semibold'">
                     {{ _('pricing.annual') or 'Annual' }}
-                    <span class="text-green-500 text-sm ml-1">{{ _('pricing.save_20') or 'Save 20%' }}</span>
+                    <span class="text-green-500 text-sm ml-1">{{ _('pricing.save_months') or 'Save 2 months!' }}</span>
                 </span>
             </div>
 
@@ -74,8 +74,8 @@
                         {# Price #}
                         <div class="mb-6">
                             <span class="text-4xl font-extrabold text-gray-900 dark:text-white"
-                                  x-text="annual ? '{{ tier.annual_price or (tier.monthly_price * 10)|int }}' : '{{ tier.monthly_price }}'">
-                                {{ tier.monthly_price }}
+                                  x-text="annual ? '{{ tier.price_annual or (tier.price_monthly * 10)|int }}' : '{{ tier.price_monthly }}'">
+                                {{ tier.price_monthly }}
                             </span>
                             <span class="text-gray-500 dark:text-gray-400">/{{ _('pricing.month') or 'mo' }}</span>
                         </div>