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/typedefs.ts

@@ -795,6 +795,7 @@ export const typeDefs = gql`
     date: DateTime!
     status: ScheduleStatus!
     hoursWorked: Float
+    overtimeHours: Float
     notes: String
     employee: Employee!
     createdAt: DateTime!
@@ -863,6 +864,7 @@ export const typeDefs = gql`
     date: DateTime!
     status: ScheduleStatus!
     hoursWorked: Float
+    overtimeHours: Float
     notes: String
   }