feat: marchés 4H + lien TradingView + cache IL + perf chargement

- charts Marchés : interval D/W → 4H (240), hauteur 220 → 420px, grid 2col
- TvAdvancedChart : bouton "↗ TradingView" par chart (outils tracé complets)
- cache fichier IL 2h (data/il-enrichment-cache.json) : API rate-proba 13s → <500ms
- stale-while-revalidate macro : affiche cache immédiatement, refetch 10s background
- seuil cache rate-proba : 48h → 7j pour dev local

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

app/page.tsx

@@ -599,10 +599,10 @@ export default function Dashboard() {
             <div className="h-px flex-1 bg-sky-500/20" />
           </div>
           <div className="grid grid-cols-2 gap-4">
-            <TvAdvancedChart symbol="FOREXCOM:SPXUSD" label="S&P 500"          interval="D" height={220} />
-            <TvAdvancedChart symbol="PEPPERSTONE:VIX" label="VIX"              interval="D" height={220} />
-            <TvAdvancedChart symbol="CAPITALCOM:DXY"  label="DXY Dollar Index" interval="W" height={220} />
-            <TvAdvancedChart symbol="TVC:GOLD"        label="Or (XAU/USD)"     interval="W" height={220} />
+            <TvAdvancedChart symbol="FOREXCOM:SPXUSD" label="S&P 500"          interval="240" height={420} />
+            <TvAdvancedChart symbol="PEPPERSTONE:VIX" label="VIX"              interval="240" height={420} />
+            <TvAdvancedChart symbol="CAPITALCOM:DXY"  label="DXY Dollar Index" interval="240" height={420} />
+            <TvAdvancedChart symbol="TVC:GOLD"        label="Or (XAU/USD)"     interval="240" height={420} />
           </div>
         </div>
       )}

components/TvChart.tsx

@@ -84,13 +84,16 @@ export function TvAdvancedChart({
         backgroundColor:      "rgba(8,12,20,0)",
         gridColor:            "rgba(30,45,61,0.5)",
         hide_top_toolbar:     false,
+        hide_side_toolbar:    false,
         hide_legend:          false,
         allow_symbol_change:  false,
         calendar:             false,
         hide_volume:          false,
         isTransparent:        true,
         save_image:           true,
+        withdateranges:       true,
         drawings_access:      { type: "all" },
+        support_host:         "https://www.tradingview.com",
         container_id:         containerId,
       },
       height
@@ -102,13 +105,29 @@ export function TvAdvancedChart({
     };
   }, []); // eslint-disable-line
 
+  const tvUrl = `https://www.tradingview.com/chart/?symbol=${encodeURIComponent(symbol)}&interval=${interval}`;
+
   return (
     <div className="flex flex-col gap-1">
-      {label && (
-        <p className="text-[10px] font-semibold text-slate-500 uppercase tracking-wider">
-          {label}
-        </p>
-      )}
+      <div className="flex items-center justify-between">
+        {label && (
+          <p className="text-[10px] font-semibold text-slate-500 uppercase tracking-wider">{label}</p>
+        )}
+        <a
+          href={tvUrl}
+          target="_blank"
+          rel="noopener noreferrer"
+          className="flex items-center gap-1 text-[9px] text-slate-600 hover:text-sky-400 transition-colors ml-auto"
+          title="Ouvrir dans TradingView (outils de tracé complets)"
+        >
+          <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+            <path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"/>
+            <polyline points="15 3 21 3 21 9"/>
+            <line x1="10" y1="14" x2="21" y2="3"/>
+          </svg>
+          TradingView
+        </a>
+      </div>
       <div
         ref={wrapperRef}
         className="tradingview-widget-container rounded-lg overflow-hidden bg-[#0f1623]"

lib/rateprobability.ts

@@ -3,11 +3,35 @@
 // Collectées par GitHub Actions (toutes les heures) → data/rate-probabilities.json
 // InvestingLive (Giuseppe Dellamotta) en enrichissement CHF + deltas hebdo
 
-import { readFileSync } from "fs";
+import { readFileSync, writeFileSync } from "fs";
 import { join } from "path";
 import type { Currency } from "./types";
 import { fetchILExpectationsWithHistory } from "./investinglive";
-import type { ILExpectationsMap } from "./investinglive";
+import type { ILExpectationsMap, ILExpectationsWithHistory } from "./investinglive";
+
+// ── Cache fichier pour les données InvestingLive (évite 56 HTTP HEAD par appel) ──
+
+const IL_CACHE_FILE = join(process.cwd(), "data", "il-enrichment-cache.json");
+const IL_CACHE_TTL  = 2 * 60 * 60 * 1000; // 2h
+
+async function getCachedILHistory(): Promise<ILExpectationsWithHistory> {
+  try {
+    const raw    = readFileSync(IL_CACHE_FILE, "utf8");
+    const cached = JSON.parse(raw) as { ts: number; data: ILExpectationsWithHistory };
+    if (Date.now() - cached.ts < IL_CACHE_TTL) {
+      console.log(`[IL-cache] HIT (${Math.round((Date.now() - cached.ts) / 60000)}min old)`);
+      return cached.data;
+    }
+    console.log("[IL-cache] STALE — refetch");
+  } catch {
+    console.log("[IL-cache] MISS — premier fetch");
+  }
+  const data = await fetchILExpectationsWithHistory();
+  try {
+    writeFileSync(IL_CACHE_FILE, JSON.stringify({ ts: Date.now(), data }));
+  } catch { /* /tmp read-only en prod Vercel — ignoré */ }
+  return data;
+}
 
 // ── Types publics ──────────────────────────────────────────────────────────────
 
@@ -291,7 +315,7 @@ function parseCBBody(ccy: Currency, body: Record<string, unknown>): CBRatePath |
 export async function fetchAllCBPaths(): Promise<RateProbData> {
   // GitHub Actions met à jour data/rate-probabilities.json toutes les heures
   // (CME FedWatch pour USD, Investing.com pour les autres, InvestingLive en fallback)
-  const [ilHistory] = await Promise.all([fetchILExpectationsWithHistory()]);
+  const [ilHistory] = await Promise.all([getCachedILHistory()]);
   const ilData   = ilHistory.current;
   const ilPrev   = ilHistory.prev;
   const prevDate = ilHistory.prevDate;