fix: restore custom vote icons (#1)

fixes the broken upvote-downvote icons on nodebb

Reviewed-on: #1
Reviewed-by: xtul <mpiasecki720@protonmail.com>
Co-authored-by: vickydotbat <vickydotbat@tutamail.com>
Co-committed-by: vickydotbat <vickydotbat@tutamail.com>

tests/post-vote-icons.test.js

@@ -0,0 +1,31 @@
+const assert = require("assert");
+const fs = require("fs");
+const path = require("path");
+
+const stylesheet = fs.readFileSync(
+	path.join(__dirname, "..", "scss", "westgate", "_posts.scss"),
+	"utf8"
+);
+
+assert(
+	!stylesheet.includes("Font Awesome 6 Free"),
+	"Post vote icons must not hard-code the retired Font Awesome 6 family"
+);
+
+assert.match(
+	stylesheet,
+	/i\.fa-chevron-up\s*\{[^}]*--fa:\s*"\\f004"/s,
+	"The upvote button should reuse Harmony's Font Awesome element with the fa-heart glyph"
+);
+
+assert.match(
+	stylesheet,
+	/i\.fa-chevron-down\s*\{[^}]*--fa:\s*"\\f7a9"/s,
+	"The downvote button should reuse Harmony's Font Awesome element with the fa-heart-crack glyph"
+);
+
+assert.doesNotMatch(
+	stylesheet,
+	/\[component="post\/(?:upvote|downvote)"\][\s\S]*?&::before\s*\{/,
+	"Vote icons should not bypass Font Awesome's element and family handling with custom pseudo-elements"
+);