feat: add price filter and dynamic slider to catalog

- Implemented JavaScript-based price slider for catalog filtering
- Updated catalog views to handle min/max price inputs and compute slider bounds
- Enhanced templates (`index.html`, `side-bar.html`) with filtering form and updated URLs
- Added CSS for price slider styling and form layout
- Introduced utility functions for URL building and price parsing
- Expanded tests for price filtering, sliders, and sidebar active states
- Updated context processor and header for dynamic navigation with price filters

santehray/context_processors.py

@@ -43,4 +43,7 @@ def navigation(request):
         "navigation_selected_value": selected_value,
         "navigation_selected_category_slug": current_category.slug if current_category else None,
         "navigation_selected_subcategory_slug": current_subcategory.slug if current_subcategory else None,
+        "navigation_search_query": request.GET.get("q", "").strip(),
+        "navigation_min_price": request.GET.get("min_price", "").strip(),
+        "navigation_max_price": request.GET.get("max_price", "").strip(),
     }

santehray/settings.py

@@ -62,6 +62,17 @@ def env_log_level(name: str, default: str = "INFO") -> str:
     return normalized
 
 
+def env_choice(name: str, default: str, allowed: set[str]) -> str:
+    value = os.getenv(name, default)
+    if not value:
+        return default
+
+    normalized = value.strip().lower()
+    if normalized not in allowed:
+        return default
+    return normalized
+
+
 def merge_unique(*value_lists: list[str]) -> list[str]:
     merged: list[str] = []
     seen: set[str] = set()
@@ -176,6 +187,20 @@ SECURE_PROXY_SSL_HEADER = env_pair(
     "SECURE_PROXY_SSL_HEADER",
     ("HTTP_X_FORWARDED_PROTO", "https"),
 )
+SECURE_REFERRER_POLICY = env_choice(
+    "SECURE_REFERRER_POLICY",
+    "strict-origin-when-cross-origin",
+    {
+        "no-referrer",
+        "no-referrer-when-downgrade",
+        "origin",
+        "origin-when-cross-origin",
+        "same-origin",
+        "strict-origin",
+        "strict-origin-when-cross-origin",
+        "unsafe-url",
+    },
+)
 
 # Application definition