fix: clamp z.ai raw-percentage usedPercent fallback to 0...100

Sources/CodexBarCore/Providers/Zai/ZaiUsageStats.swift

@@ -84,7 +84,9 @@ extension ZaiLimitEntry {
         if let computed = self.computedUsedPercent {
             return computed
         }
-        return self.percentage
+        // The raw API percentage can fall outside 0...100 (z.ai omits/misreports quota fields);
+        // clamp it like computedUsedPercent and every sibling provider instead of surfacing it raw.
+        return min(100, max(0, self.percentage))
     }
 
     public var windowMinutes: Int? {

TestsLinux/ZaiUsedPercentLinuxTests.swift

@@ -0,0 +1,52 @@
+#if os(Linux)
+import CodexBarCore
+import Foundation
+import Testing
+
+struct ZaiUsedPercentLinuxTests {
+    /// usage == nil forces computedUsedPercent to return nil, exercising the raw-percentage fallback.
+    private func fallbackUsedPercent(_ percentage: Double) -> Double {
+        ZaiLimitEntry(
+            type: .tokensLimit,
+            unit: .hours,
+            number: 5,
+            usage: nil,
+            currentValue: nil,
+            remaining: nil,
+            percentage: percentage,
+            usageDetails: [],
+            nextResetTime: nil).usedPercent
+    }
+
+    @Test
+    func `raw percentage fallback clamps above 100`() {
+        #expect(self.fallbackUsedPercent(150) == 100)
+    }
+
+    @Test
+    func `raw percentage fallback clamps below 0`() {
+        #expect(self.fallbackUsedPercent(-5) == 0)
+    }
+
+    @Test
+    func `raw percentage fallback preserves an in-range value`() {
+        #expect(self.fallbackUsedPercent(42) == 42)
+    }
+
+    @Test
+    func `computed path takes precedence and ignores the raw percentage`() {
+        // usage(limit)=100, currentValue(used)=25 -> computed 25%, so the raw 999 must not leak.
+        let entry = ZaiLimitEntry(
+            type: .tokensLimit,
+            unit: .hours,
+            number: 5,
+            usage: 100,
+            currentValue: 25,
+            remaining: nil,
+            percentage: 999,
+            usageDetails: [],
+            nextResetTime: nil)
+        #expect(entry.usedPercent == 25)
+    }
+}
+#endif