fix(hosting): site detail null guard + cleaner preview URLs

- Site detail template: x-show → x-if to prevent Alpine evaluating
  expressions when site is null during async loading
- Slugify: prefer domain_name over business_name for subdomain
  generation (batirenovation-strasbourg vs bati-rnovation-strasbourg-
  peinture-ravalement-dans). Cap at 30 chars. Strip protocol/TLD.
- POC builder passes domain_name for clean slugs
- Remove .lu/.fr/.com TLD from slugs automatically

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/hosting/services/hosted_site_service.py

@@ -35,11 +35,19 @@ ALLOWED_TRANSITIONS: dict[HostedSiteStatus, list[HostedSiteStatus]] = {
 
 
 def _slugify(name: str) -> str:
-    """Generate a URL-safe slug from a business name."""
+    """Generate a short URL-safe slug from a business name or domain."""
     slug = name.lower().strip()
+    # Remove protocol/www if domain was passed
+    for prefix in ["https://", "http://", "www."]:
+        if slug.startswith(prefix):
+            slug = slug[len(prefix):]
+    slug = slug.rstrip("/")
+    # Remove TLD if it looks like a domain
+    if "." in slug and " " not in slug:
+        slug = slug.rsplit(".", 1)[0]
     slug = re.sub(r"[^a-z0-9\s-]", "", slug)
     slug = re.sub(r"[\s-]+", "-", slug)
-    return slug.strip("-")[:50]
+    return slug.strip("-")[:30]
 
 
 class HostedSiteService:
@@ -101,7 +109,9 @@ class HostedSiteService:
         business_name = data["business_name"]
         merchant_id = data.get("merchant_id")
         prospect_id = data.get("prospect_id")
-        slug = _slugify(business_name)
+        # Prefer domain_name for slug (shorter, cleaner), fall back to business_name
+        slug_source = data.get("domain_name") or business_name
+        slug = _slugify(slug_source)
 
         # Find hosting platform
         platform = db.query(Platform).filter(Platform.code == "hosting").first()

app/modules/hosting/services/poc_builder_service.py

@@ -60,6 +60,7 @@ class PocBuilderService:
         # 4. Create HostedSite + Store
         site_data = {
             "business_name": context["business_name"],
+            "domain_name": prospect.domain_name,  # used for clean subdomain slug
             "prospect_id": prospect_id,
             "contact_email": context.get("email"),
             "contact_phone": context.get("phone"),

app/modules/hosting/templates/hosting/admin/site-detail.html

@@ -12,7 +12,8 @@
 {{ loading_state('Loading site...') }}
 {{ error_state('Error loading site') }}
 
-<div x-show="!loading && !error && site" class="space-y-6">
+<template x-if="!loading && !error && site">
+<div class="space-y-6">
     <!-- Header -->
     <div class="flex flex-col sm:flex-row sm:items-center justify-between my-6 gap-4">
         <div class="flex items-center space-x-4">
@@ -187,6 +188,7 @@
         </div>
     </div>
 </div>
+</template>
 
 <!-- Send Proposal Modal -->
 {% call modal('proposalModal', 'Send Proposal', show_var='showProposalModal', size='md', show_footer=false) %}