fix: handle {#if} template conditionals and raw-text style/script in elc

Parser now supports {#if cond}...{#else}...{/if} blocks as HtmlIf AST nodes.
Style and script elements collect content as raw text, bypassing El expression
parsing entirely — eliminating O(n²) CSS parse time on large style blocks.

src/marketplace.el

@@ -133,8 +133,6 @@ fn marketplace() -> String {
 
   <script src="/js/marketplace.js" defer></script>
 
-</section>
-
 <style>
   #marketplace { padding: 6rem 0; }
   .marketplace-header { margin-bottom: 4rem; }
@@ -229,4 +227,6 @@ fn marketplace() -> String {
   }
   .dev-textarea { resize: vertical; min-height: 120px; }
 </style>
+
+</section>
 }