fix: Sem. préc. HEAD→GET, prevMeetings cache, remove footer

- investinglive: tryUrl HEAD→GET + res.body?.cancel() (WordPress bloque HEAD)
  fenêtre recherche article préc. élargie 21→28 jours
- rateprobability: CBRatePath + prevMeetings/prevWeekDate, loadPrevWeekCachedBody()
  fetchAllCBPaths enrichit prevMeetings depuis snapshot GitHub Actions
- fetch-rate-data.mjs: rotation current→previousWeek (5–9 jours) pour Rate Curve
- CurrencyCard: rateCurveData préfère prevMeetings (exact/meeting) > ilDelta (approx)
  légende hasPrevCurve pilote affichage ligne bleue et label date
- page.tsx: suppression footer Sources/LLM, remplacement par pb-12

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/investinglive.ts

@@ -52,12 +52,15 @@ async function tryUrl(daysAgo: number): Promise<ArticleRef | null> {
   const dateStr  = `${yyyymmdd.slice(0,4)}-${yyyymmdd.slice(4,6)}-${yyyymmdd.slice(6,8)}`;
   const url = `https://investinglive.com/news/how-have-interest-rate-expectations-changed-after-this-weeks-event-${yyyymmdd}/`;
   try {
+    // GET au lieu de HEAD — certains serveurs WordPress refusent HEAD (405/404 même si la page existe)
     const res = await fetch(url, {
-      method:  "HEAD",
+      method:  "GET",
       headers: { "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/124.0.0.0 Safari/537.36" },
       cache:   "no-store",
     });
-    return res.ok ? { url, dateStr, daysAgo } : null;
+    if (!res.ok) return null;
+    await res.body?.cancel(); // libère la connexion sans télécharger le body
+    return { url, dateStr, daysAgo };
   } catch { return null; }
 }
 
@@ -73,8 +76,8 @@ async function findArticleRefs(): Promise<{ current: ArticleRef | null; previous
   if (!current) return { current: null, previous: null };
 
   let previous: ArticleRef | null = null;
-  // Start the day after the current article and look up to 21 days further back
-  for (let d = current.daysAgo + 1; d <= current.daysAgo + 21; d++) {
+  // Start the day after the current article and look up to 28 days further back
+  for (let d = current.daysAgo + 1; d <= current.daysAgo + 28; d++) {
     const found = await tryUrl(d);
     if (found) { previous = found; break; }
   }