feat: add VidIQ badge reader with unset selector

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/lib/vidiq.js

@@ -0,0 +1,14 @@
+// CSS selector of VidIQ's outlier badge on a video card. It stays null until the real
+// markup is captured (Task 15); until then readVidiqScore returns null for every card.
+export const VIDIQ_BADGE_SELECTOR = null;
+
+export function parseVidiqScore(text) {
+  const match = /(\d+(?:[.,]\d+)?)/.exec(text ?? '');
+  return match ? Number(match[1].replace(',', '.')) : null;
+}
+
+export function readVidiqScore(card, selector = VIDIQ_BADGE_SELECTOR) {
+  if (!selector || !card) return null;
+  const badge = card.querySelector(selector);
+  return badge ? parseVidiqScore(badge.textContent) : null;
+}