feat(api): limits read unifiedWindows, unknown seven-day windows labelled by model

ui/src/lib/limits.ts

@@ -6,8 +6,18 @@ export const LIMIT_LABELS: Record<string, string> = {
   seven_day_sonnet: "7-day · Sonnet",
 };
 
+const SEVEN_DAY = "seven_day_";
+
 export function limitLabel(window: string): string {
-  return LIMIT_LABELS[window] ?? window;
+  const known = LIMIT_LABELS[window];
+  if (known) {
+    return known;
+  }
+  if (window.startsWith(SEVEN_DAY)) {
+    const model = window.slice(SEVEN_DAY.length);
+    return `7-day · ${model.charAt(0).toUpperCase()}${model.slice(1)}`;
+  }
+  return window.replaceAll("_", " ");
 }
 
 // The status as a word, for the windows the API never puts a figure on.