## MODIFIED Requirements
### Requirement: Workload Heatmap UI
The system SHALL provide a visual workload heatmap interface for managers.

#### Scenario: View workload heatmap
- **GIVEN** user is logged in as manager or admin
- **WHEN** user navigates to /workload page without filters
- **THEN** system displays a heatmap showing all accessible users' workload
- **AND** users with zero workload are included by default
- **AND** each user cell is color-coded by load level (green/yellow/red)

#### Scenario: Hide empty workloads
- **GIVEN** user is viewing the workload page
- **WHEN** user enables the hide_empty filter
- **THEN** the heatmap excludes users with zero workload

#### Scenario: Navigate between weeks
- **GIVEN** user is viewing the workload page
- **WHEN** user clicks previous/next week buttons
- **THEN** the heatmap updates to show that week's workload data

#### Scenario: Default week window on Sunday
- **GIVEN** today is Sunday and user opens workload page without selecting week_start
- **THEN** the default heatmap window includes tasks due in the upcoming week

#### Scenario: View user workload details
- **GIVEN** user is viewing the workload heatmap
- **WHEN** user clicks on a specific user's cell
- **THEN** a modal/drawer opens showing that user's task breakdown
- **AND** tasks show title, project, time estimate, and due date

#### Scenario: Filter by department
- **GIVEN** user is a system admin
- **WHEN** user selects a department from the filter
- **THEN** the heatmap shows only users from that department