Adds parent template tracking to snippet drops

Enhances snippet drops to track their parent template name, enabling better error reporting and context awareness within rendered snippets.

Updates the render tag to use parent template names for proper context variable naming and improves error handling flow.

lib/liquid/snippet_drop.rb

@@ -2,12 +2,13 @@
 
 module Liquid
   class SnippetDrop < Drop
-    attr_reader :body, :name
+    attr_reader :body, :name, :parent_name
 
-    def initialize(body, name)
+    def initialize(body, name, parent_name)
       super()
       @body = body
       @name = name
+      @parent_name = parent_name
     end
 
     def to_partial

lib/liquid/tags/render.rb

@@ -51,19 +51,18 @@ module Liquid
 
       if template.respond_to?(:to_partial)
         partial = template.to_partial
-        template_name = template.name
+        template_name = template.parent_name
+        context_variable_name = @alias_name || template.name.split('/').last
+
       elsif @template_name_expr.is_a?(String)
         partial = PartialCache.load(template, context: context, parse_context: parse_context)
         template_name = partial.name
-      elsif template.nil?
-        template_name = @template_name_expr.respond_to?(:name) ? @template_name_expr.name : @template_name_expr
-        raise FileSystemError, "No such template '#{template_name}'"
+        context_variable_name = @alias_name || template_name.split('/').last
+
       else
         raise ::ArgumentError, parse_context.locale.t("errors.argument.render")
       end
 
-      context_variable_name = @alias_name || template_name.split('/').last
-
       render_partial_func = ->(var, forloop) {
         inner_context               = context.new_isolated_subcontext
         inner_context.template_name = template_name

lib/liquid/tags/snippet.rb

@@ -26,7 +26,7 @@ module Liquid
     end
 
     def render_to_output_buffer(context, output)
-      snippet_drop = SnippetDrop.new(@body, @to)
+      snippet_drop = SnippetDrop.new(@body, @to, context.template_name)
       context.scopes.last[@to] = snippet_drop
       context.resource_limits.increment_assign_score(assign_score_of(snippet_drop))
       output