fix: default missing remainingFraction to 1 instead of 0

Models without quota data (e.g. tab-completion models) were showing 0%
because remainingFraction defaulted to 0 when absent. Now defaults to 1
so they show 100% remaining instead.

open-sse/services/usage.ts

@@ -703,8 +703,10 @@ async function getAntigravityUsage(accessToken, providerSpecificData) {
         continue;
       }
 
-      const remainingFraction = toNumber(quotaInfo.remainingFraction, 0);
+      const rawFraction = toNumber(quotaInfo.remainingFraction, -1);
       const resetAt = parseResetTime(quotaInfo.resetTime);
+      // Default to 100% when the API doesn't report a fraction
+      const remainingFraction = rawFraction < 0 ? 1 : rawFraction;
       // Models with no resetTime and full remaining are unlimited (e.g. tab-completion models)
       const isUnlimited = !resetAt && remainingFraction >= 1;
       const remainingPercentage = remainingFraction * 100;