feat: Comprehensive employee management system improvements

- ✨ Added compact employee forms (add/edit) with all fields visible
- 🎯 Implemented expandable employee rows with timesheet integration
- 📊 Added real KPI calculation based on work hours, sick days, and overtime
- 📅 Added bulk date selection and editing in calendar
- 🗓️ Implemented day-specific editing modal with hours and overtime tracking
- 💾 Extended database schema with overtimeHours field
- 🎨 Improved UI layout: tabs left, search right, real current date display
- 🧹 Fixed spacing issues and removed unnecessary gaps
- 🔧 Enhanced GraphQL mutations for employee schedule management

src/graphql/resolvers.ts

@@ -81,6 +81,7 @@ interface UpdateScheduleInput {
   date: string;
   status: "WORK" | "WEEKEND" | "VACATION" | "SICK" | "ABSENT";
   hoursWorked?: number;
+  overtimeHours?: number;
   notes?: string;
 }
 
@@ -4794,11 +4795,13 @@ export const resolvers = {
             date: new Date(args.input.date),
             status: args.input.status,
             hoursWorked: args.input.hoursWorked,
+            overtimeHours: args.input.overtimeHours,
             notes: args.input.notes,
           },
           update: {
             status: args.input.status,
             hoursWorked: args.input.hoursWorked,
+            overtimeHours: args.input.overtimeHours,
             notes: args.input.notes,
           },
         });