feat(usage): redesign Usage Analytics with accurate token averages

- Fix token averaging: calculate over active hours/days only (not full period)
- Enable hourlyData query for all time ranges (not just 24h)
- Rename 'Usage Forecast' to 'Usage Averages' (real data, not projections)
- Add avg/request metric and active hours/days context
- Update terminology: Input/Output Tokens with info tooltips
- Add Estimated Cost stat card with per-model calculation
- Add quota warning alert banner when models exceed 80%
- Add ModelQuotaBar component with color thresholds

src/components/usage/NivoTooltip.tsx

@@ -1,11 +1,18 @@
 /** Premium chart palette — refined for dark mode contrast */
-export const COLOR_PROMPT = '#60a5fa';   // blue-400
+export const COLOR_PROMPT = '#60a5fa'; // blue-400
 export const COLOR_COMPLETION = '#34d399'; // emerald-400
-export const COLOR_TOTAL = '#fbbf24';      // amber-400
+export const COLOR_TOTAL = '#fbbf24'; // amber-400
 
 export const PIE_COLORS = [
-  '#60a5fa', '#34d399', '#fbbf24', '#a78bfa', '#f472b6',
-  '#38bdf8', '#4ade80', '#facc15', '#c084fc',
+  '#60a5fa',
+  '#34d399',
+  '#fbbf24',
+  '#a78bfa',
+  '#f472b6',
+  '#38bdf8',
+  '#4ade80',
+  '#facc15',
+  '#c084fc',
 ];
 
 export const MODEL_COLORS: Record<string, string> = {
@@ -31,10 +38,7 @@ export function BarTooltip({ indexValue, data }: any) {
       <div className="flex flex-col gap-1">
         {keys.map((key: string) => (
           <div key={key} className="flex items-center gap-2 text-xs">
-            <span
-              className="h-2 w-2 rounded-full"
-              style={{ backgroundColor: colorMap[key] }}
-            />
+            <span className="h-2 w-2 rounded-full" style={{ backgroundColor: colorMap[key] }} />
             <span className="text-muted-foreground">{key}:</span>
             <span className="text-foreground font-mono font-medium">
               {typeof data[key] === 'number' ? data[key].toLocaleString() : data[key]}
@@ -50,10 +54,7 @@ export function PieTooltip({ datum }: any) {
   return (
     <div className="bg-popover rounded-lg border border-white/[0.06] px-3 py-2 shadow-md">
       <div className="flex items-center gap-2 text-xs">
-        <span
-          className="h-2 w-2 rounded-full"
-          style={{ backgroundColor: datum.color }}
-        />
+        <span className="h-2 w-2 rounded-full" style={{ backgroundColor: datum.color }} />
         <span className="text-muted-foreground">{datum.id}:</span>
         <span className="text-foreground font-mono font-medium">
           {typeof datum.value === 'number' ? datum.value.toLocaleString() : datum.value}
@@ -66,12 +67,11 @@ export function PieTooltip({ datum }: any) {
 export function LineTooltip({ point }: any) {
   return (
     <div className="bg-popover rounded-lg border border-white/[0.06] px-3 py-2 shadow-md">
-      <p className="text-foreground mb-1 text-xs font-medium">{point.data.xFormatted ?? point.data.x}</p>
+      <p className="text-foreground mb-1 text-xs font-medium">
+        {point.data.xFormatted ?? point.data.x}
+      </p>
       <div className="flex items-center gap-2 text-xs">
-        <span
-          className="h-2 w-2 rounded-full"
-          style={{ backgroundColor: point.serieColor }}
-        />
+        <span className="h-2 w-2 rounded-full" style={{ backgroundColor: point.serieColor }} />
         <span className="text-muted-foreground">{point.serieId}:</span>
         <span className="text-foreground font-mono font-medium">
           {typeof point.data.y === 'number' ? point.data.y.toLocaleString() : point.data.y}