feat(post): add user ID with color specific to user address

src/lib/utils/post-utils.ts

@@ -0,0 +1,18 @@
+export function hashStringToColor(str: string): string {
+  let hash = 0;
+  for (let i = 0; i < str.length; i++) {
+    hash = str.charCodeAt(i) + ((hash << 5) - hash);
+  }
+
+  const r = (hash >> 24) & 0xff;
+  const g = (hash >> 16) & 0xff;
+  const b = (hash >> 8) & 0xff;
+
+  return `rgb(${r}, ${g}, ${b})`;
+}
+
+export function getTextColorForBackground(rgb: string): string {
+  const [r, g, b] = rgb.match(/\d+/g)?.map(Number) || [0, 0, 0];
+  const brightness = r * 0.299 + g * 0.587 + b * 0.114;
+  return brightness > 125 ? 'black' : 'white';
+}