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/quick-search-results.tpl

@@ -21,7 +21,7 @@
 		</a>
 		<div class="d-flex gap-2 post-info px-2 text-xs">
 			<div class="category-item d-inline-block ff-secondary">
-				{buildCategoryLabel(posts.category, "span")}
+				{{buildCategoryLabel(posts.category, "span")}}
 			</div>
 			<span class="timeago text-muted" title="{posts.timestampISO}"></span>
 		</div>