Port templates to NodeBB 4.14 benchpress escaping (#19)

NodeBB 4.14 turned on real HTML escaping for single-brace template interpolations (4.13 used an identity escape). This ports raw-HTML output to the double-brace forms ({{helper(...)}}, {{txEscape(content)}}, {{tx(name)}}), mirroring the harmony 2.2.72 -> 3.0.15 and core 4.13.2 -> 4.14.0 template diffs. Fixes the escaped-markup breakage on westgate.pw after the 2026.07.11-1 deploy.

Verified on a fresh 4.14.0 dev stack: no escaped tags on /, /categories, /category/2, /topic/1, /search; contract tests pass.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: vickydotbat <vickydotbat@tutamail.com>
Reviewed-on: #19
Reviewed-by: xtul <mpiasecki720@protonmail.com>
Co-authored-by: gitea-bot <gitea-bot@noreply.git.westgate.pw>
Co-committed-by: gitea-bot <gitea-bot@noreply.git.westgate.pw>

templates/partials/categories/item.tpl

@@ -3,7 +3,7 @@
 
 	<div class="d-flex col-lg-7 gap-2 gap-lg-3">
 		<div class="flex-shrink-0">
-		{buildCategoryIcon(@value, "40px", "rounded-1")}
+		{{buildCategoryIcon(@value, "40px", "rounded-1")}}
 		</div>
 		<div class="flex-grow-1 d-flex flex-wrap gap-1 me-0 me-lg-2">
 			<h2 class="title text-break fs-4 fw-semibold m-0 tracking-tight w-100">
@@ -11,7 +11,7 @@
 			</h2>
 			{{{ if ./descriptionParsed }}}
 			<div class="description text-muted text-sm w-100 line-clamp-sm-5">
-				{./descriptionParsed}
+				{{./descriptionParsed}}
 			</div>
 			{{{ end }}}
 			{{{ if !./link }}}