feat: use FY labels in generation sheet based on COD date

- Show FY 2026-27 instead of Y1 based on cod_year
- Show month names (Apr, May, etc.) instead of M1, M2
- Show actual dates (Apr 1, etc.) instead of D1, D2
- Pass codYear from scenario inputs to WorkbookView

packages/web/app/scenarios/[id]/page.tsx

@@ -229,6 +229,14 @@ export default function ScenarioPage() {
                   kpis={kpis}
                   debtScheduleJson={scenario?.debt_schedule_json ?? null}
                   activeSheet={activeSheet}
+                  codYear={(() => {
+                    try {
+                      const inputs = scenario?.inputs_json ? JSON.parse(scenario.inputs_json) : {};
+                      return inputs?.project?.cod_year || inputs?.project?.cod_date
+                        ? new Date(inputs.project.cod_date || inputs.project.cod_year + '-04-01').getFullYear()
+                        : new Date().getFullYear();
+                    } catch { return new Date().getFullYear(); }
+                  })()}
                 />
               ) : scenario?.status === "failed" ? (
                 <div className="border border-red-200 rounded-lg p-6 text-sm max-w-lg">

packages/web/components/WorkbookView.tsx

@@ -533,12 +533,25 @@ interface HourlyData {
   wind_hourly?: number[];
 }
 
-function HourlyGenerationSheet({ hourly }: { hourly: HourlyData }) {
+function HourlyGenerationSheet({ hourly, codYear }: { hourly: HourlyData; codYear?: number }) {
   const { solar_hourly, wind_hourly } = hourly;
   const hasSolar = solar_hourly && solar_hourly.length > 0;
   const hasWind = wind_hourly && wind_hourly.length > 0;
   const hasData = hasSolar || hasWind;
 
+  // FY labels: if COD is April 2026, FY 2026-27 = Year 1
+  const getFyLabel = (yearIndex: number) => {
+    const startYear = codYear || new Date().getFullYear();
+    const fyStart = startYear + yearIndex;
+    const fyEnd = fyStart + 1;
+    return `FY ${String(fyStart).slice(-2)}-${String(fyEnd).slice(-2)}`;
+  };
+
+  const getMonthLabel = (month: number, yearIndex: number) => {
+    const monthNames = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
+    return monthNames[month - 1];
+  };
+
   // Expand state: which years/months/days are expanded
   const [expandedYears, setExpandedYears] = useState<Set<number>>(new Set());
   const [expandedMonths, setExpandedMonths] = useState<Set<string>>(new Set());
@@ -623,6 +636,7 @@ function HourlyGenerationSheet({ hourly }: { hourly: HourlyData }) {
         const isYearExpanded = expandedYears.has(year);
         const solarYr = hasSolar ? computeYearTotal(year, true) : 0;
         const windYr = hasWind ? computeYearTotal(year, false) : 0;
+        const fyLabel = getFyLabel(i);
 
         return (
           <div key={year}>
@@ -631,7 +645,7 @@ function HourlyGenerationSheet({ hourly }: { hourly: HourlyData }) {
               className="w-full flex items-center gap-2 py-1.5 hover:bg-accent/40 rounded px-2 text-left font-medium"
             >
               <span className="text-[10px] w-4">{isYearExpanded ? "▼" : "▶"}</span>
-              <span className="w-12">Y{year}</span>
+              <span className="w-20 font-medium">{fyLabel}</span>
               {hasSolar && <span className="text-orange-700 w-24">{Math.round(solarYr).toLocaleString()} MWh</span>}
               {hasWind && <span className="text-blue-700 w-24">{Math.round(windYr).toLocaleString()} MWh</span>}
             </button>
@@ -644,6 +658,7 @@ function HourlyGenerationSheet({ hourly }: { hourly: HourlyData }) {
               const solarMo = hasSolar ? computeMonthTotal(year, month, true) : 0;
               const windMo = hasWind ? computeMonthTotal(year, month, false) : 0;
               const daysInMonth = MONTH_DAYS[month - 1];
+              const monthLabel = getMonthLabel(month, i);
 
               return (
                 <div key={monthKey} className="ml-4">
@@ -652,7 +667,7 @@ function HourlyGenerationSheet({ hourly }: { hourly: HourlyData }) {
                     className="w-full flex items-center gap-2 py-1 hover:bg-accent/30 rounded px-2 text-left"
                   >
                     <span className="text-[10px] w-4">{isMonthExpanded ? "▼" : "▶"}</span>
-                    <span className="w-12 text-muted-foreground">M{month}</span>
+                    <span className="w-12 text-muted-foreground">{monthLabel}</span>
                     {hasSolar && <span className="text-orange-700/80 w-24">{Math.round(solarMo).toLocaleString()} MWh</span>}
                     {hasWind && <span className="text-blue-700/80 w-24">{Math.round(windMo).toLocaleString()} MWh</span>}
                   </button>
@@ -672,7 +687,7 @@ function HourlyGenerationSheet({ hourly }: { hourly: HourlyData }) {
                           className="w-full flex items-center gap-2 py-0.5 hover:bg-accent/20 rounded px-2 text-left"
                         >
                           <span className="text-[10px] w-4">{isDayExpanded ? "▼" : "▶"}</span>
-                          <span className="w-12 text-muted-foreground/80">D{day}</span>
+                          <span className="w-12 text-muted-foreground/80">{monthLabel} {day}</span>
                           {hasSolar && <span className="text-orange-600/70 w-20">{Math.round(solarDy).toLocaleString()}</span>}
                           {hasWind && <span className="text-blue-600/70 w-20">{Math.round(windDy).toLocaleString()}</span>}
                         </button>
@@ -797,9 +812,10 @@ interface Props {
   kpis: KpiSummary;
   debtScheduleJson: string | null;
   activeSheet: string;
+  codYear?: number;
 }
 
-export function WorkbookView({ scenarioId, kpis, debtScheduleJson, activeSheet }: Props) {
+export function WorkbookView({ scenarioId, kpis, debtScheduleJson, activeSheet, codYear }: Props) {
   const { data: stmts } = useQuery({
     queryKey: ["statements", scenarioId],
     queryFn: () => getStatements(scenarioId),
@@ -847,7 +863,7 @@ export function WorkbookView({ scenarioId, kpis, debtScheduleJson, activeSheet }
       )}
       {activeSheet === "irr" && <IrrSheet kpis={kpis} />}
       {activeSheet === "generation" && (stmts?.solar_hourly || stmts?.wind_hourly ? (
-        <HourlyGenerationSheet hourly={{ solar_hourly: stmts?.solar_hourly, wind_hourly: stmts?.wind_hourly }} />
+        <HourlyGenerationSheet hourly={{ solar_hourly: stmts?.solar_hourly, wind_hourly: stmts?.wind_hourly }} codYear={codYear} />
       ) : generation.length > 0 ? (
         <HorizontalTable years={genYears} rows={buildGenerationRows(generation)} unit="MWh / ₹Cr" />
       ) : (