Format battery times as hours and minutes

firmware/esp32/overland-controller/overland-controller.ino

@@ -233,6 +233,31 @@ input{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px;ba
 const $=id=>document.getElementById(id);
 function fmt(n,d=1){return typeof n==="number"?n.toFixed(d):"--"}
 function temp(v){return typeof v==="number"?fmt(v,1)+"°F":"Offline"}
+function formatHours(hours){
+  if(typeof hours!=="number" || !isFinite(hours) || hours<=0){
+    return "Idle";
+  }
+
+  const totalMinutes=Math.round(hours*60);
+
+  if(totalMinutes < 1){
+    return "<1m";
+  }
+
+  const h=Math.floor(totalMinutes/60);
+  const m=totalMinutes%60;
+
+  if(h===0){
+    return `${m}m`;
+  }
+
+  if(m===0){
+    return `${h}h`;
+  }
+
+  return `${h}h ${m}m`;
+}
+
 function batteryTimeInfo(b){
   if(!b.connected) return {label:"Runtime", value:"--"};
 
@@ -243,15 +268,15 @@ function batteryTimeInfo(b){
   if(typeof current==="number" && current>.1 &&
      typeof remaining==="number" && typeof capacity==="number" &&
      capacity>remaining){
-    return {label:"Time to full", value:fmt((capacity-remaining)/current,1)+"h"};
+    return {label:"Time to full", value:formatHours((capacity-remaining)/current)};
   }
 
   if(typeof b.runtime_hours==="number" && b.runtime_hours>0){
-    return {label:"Runtime", value:fmt(b.runtime_hours,1)+"h"};
+    return {label:"Runtime", value:formatHours(b.runtime_hours)};
   }
 
   if(typeof current==="number" && current<-.1 && typeof remaining==="number"){
-    return {label:"Runtime", value:fmt(remaining/Math.abs(current),1)+"h"};
+    return {label:"Runtime", value:formatHours(remaining/Math.abs(current))};
   }
 
   return {label:"Battery time", value:"Idle"};