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/search-results.tpl

@@ -23,7 +23,7 @@
 		<div class="post-body d-flex flex-column gap-1">
 			<div class="d-flex gap-3 post-info">
 				<div class="post-author d-flex gap-1">
-					<a class="lh-1 text-decoration-none" href="{config.relative_path}/user/{./user.userslug}">{buildAvatar(./user, "16px", true, "not-responsive")}</a>
+					<a class="lh-1 text-decoration-none" href="{config.relative_path}/user/{./user.userslug}">{{buildAvatar(./user, "16px", true, "not-responsive")}}</a>
 					<a class="fw-semibold text-sm" href="{config.relative_path}/user/{./user.userslug}">{../user.displayname}</a>
 				</div>
 				<span class="timeago text-sm text-muted" title="{./timestampISO}"></span>