feat(api): add stats chart endpoint for admin access with time series data

feat(dayjs): integrate dayjs for date handling and formatting across the application
refactor(routes): update date handling in id-tags, transactions, users, and dashboard routes to use dayjs
style(globals): improve CSS variable definitions for better readability and consistency
deps: add dayjs as a dependency for date manipulation

apps/csms/src/ocpp/actions/start-transaction.ts

@@ -1,4 +1,5 @@
 import { eq } from "drizzle-orm";
+import dayjs from "dayjs";
 import { useDrizzle } from "@/lib/db.js";
 import { chargePoint, connector, transaction } from "@/db/schema.js";
 import type {
@@ -35,16 +36,16 @@ export async function handleStartTransaction(
       connectorId: payload.connectorId,
       status: "Charging",
       errorCode: "NoError",
-      lastStatusAt: new Date(),
+      lastStatusAt: dayjs().toDate(),
     })
     .onConflictDoUpdate({
       target: [connector.chargePointId, connector.connectorId],
-      set: { status: "Charging", updatedAt: new Date() },
+      set: { status: "Charging", updatedAt: dayjs().toDate() },
     })
     .returning({ id: connector.id });
 
   const rejected = idTagInfo.status !== "Accepted";
-  const now = new Date();
+  const now = dayjs();
 
   // Insert transaction record regardless of auth status (OCPP spec requirement)
   const [tx] = await db
@@ -55,12 +56,12 @@ export async function handleStartTransaction(
       connectorNumber: payload.connectorId,
       idTag: payload.idTag,
       idTagStatus: idTagInfo.status,
-      startTimestamp: new Date(payload.timestamp),
+      startTimestamp: dayjs(payload.timestamp).toDate(),
       startMeterValue: payload.meterStart,
       reservationId: payload.reservationId ?? null,
       // If rejected, immediately close the transaction so it doesn't appear as in-progress
       ...(rejected && {
-        stopTimestamp: now,
+        stopTimestamp: now.toDate(),
         stopMeterValue: payload.meterStart,
         chargeAmount: 0,
         stopReason: "DeAuthorized",