Cleanup: Finalize template context integration and remove legacy code

- Replaced legacy TemplateContext calls with structured TemplateData usage
- Removed unused variables and redundant storage calls in notifications handler
- Ensured consistent use of BuildTemplateData across user-facing handlers
- Resolved all compile-time errors from refactor
- Ready for runtime testing and further layout integration

handlers/admin/audit.go

@@ -20,7 +20,7 @@ type AdminLogEntry struct {
 
 func AdminAccessLogHandler(db *sql.DB) http.HandlerFunc {
 	return middleware.Auth(true)(func(w http.ResponseWriter, r *http.Request) {
-		context := helpers.TemplateContext(w, r)
+		context := helpers.TemplateContext(w, r, models.TemplateData{})
 
 		rows, err := db.Query(`
 			SELECT accessed_at, user_id, path, ip, user_agent
@@ -56,7 +56,7 @@ func AdminAccessLogHandler(db *sql.DB) http.HandlerFunc {
 
 func AuditLogHandler(db *sql.DB) http.HandlerFunc {
 	return middleware.Auth(true)(func(w http.ResponseWriter, r *http.Request) {
-		context := helpers.TemplateContext(w, r)
+		context := helpers.TemplateContext(w, r, models.TemplateData{})
 
 		rows, err := db.Query(`
 			SELECT timestamp, user_id, action, ip, user_agent