feat(xai): track SuperGrok weekly limit + API usage quota

Fetch OAuth quota from cli-chat-proxy billing, GetGrokCreditsConfig weekly
window, and settings plan label so the dashboard matches grok.com usage.

src/app/(dashboard)/dashboard/usage/components/ProviderLimits/utils.js

@@ -451,6 +451,48 @@ export function parseQuotaData(provider, data) {
         }
         break;
 
+      case "xai":
+        // xAI mixes:
+        // - weekly: percentage window (used/total 0-100) from GetGrokCreditsConfig
+        // - api_usage: absolute monthly credits from /v1/billing
+        // For absolute rows, do not forward remainingCredits as `remaining`
+        // (QuotaTable treats remaining as a 0-100 percentage; same pitfall as Qoder).
+        if (data.quotas) {
+          Object.entries(data.quotas).forEach(([quotaType, quota]) => {
+            const name =
+              quotaType === "weekly"
+                ? "Weekly limit"
+                : quotaType === "api_usage"
+                  ? "Api usage"
+                  : quotaType === "monthly"
+                    ? "Api usage"
+                    : quotaType === "on_demand"
+                      ? "On-demand"
+                      : quotaType;
+
+            if (quotaType === "weekly") {
+              normalizedQuotas.push({
+                name,
+                used: quota.used || 0,
+                total: quota.total || 100,
+                remaining: quota.remaining,
+                remainingPercentage: quota.remainingPercentage ?? quota.remaining,
+                resetAt: quota.resetAt || null,
+              });
+              return;
+            }
+
+            normalizedQuotas.push({
+              name,
+              used: quota.used || 0,
+              total: quota.total || 0,
+              unit: quota.unit,
+              resetAt: quota.resetAt || null,
+            });
+          });
+        }
+        break;
+
       default:
         // Generic fallback for unknown providers
         if (data.quotas) {