Add dedicated workouts screen with status filtering

[Copilot]

Adds a new workouts screen to display all workouts from WorkoutManager with filtering and navigation capabilities.

Changes

New View: WorkoutsView

• Filtering: Status pills (All, Scheduled, Completed, Skipped)
• Organization: Groups workouts by date with contextual headers (Today/Yesterday/Tomorrow)
• Sorting: Chronological order within date groups
• Empty state: Guides users to AI Workout Generator when no workouts exist
• Cards: Display status, time, duration, power, intervals with intensity color coding

Navigation

• Added "Workouts" link to main menu in ContentView
• Uses figure.indoor.cycle SF Symbol

Performance

• Loads user data once at view level, passed to child components (avoids N+1 UserDataManager calls)
• Non-blocking initialization with default UserData

Testing

• Unit tests: Workout loading, filtering, grouping, sorting, empty state
• UI tests: Navigation, filter interaction, empty state display

Example Usage

// Workouts auto-group by date and sort chronologically
NavigationLink(destination: WorkoutsView()) {
    Label("Workouts", systemImage: "figure.indoor.cycle")
}

Files

• Dropped/Views/WorkoutsView.swift (314 lines)
• Dropped/ContentView.swift (+3 lines)
• DroppedTests/WorkoutsViewTests.swift (193 lines)
• DroppedUITests/WorkoutsViewUITests.swift (174 lines)
• docs/memory.md (updated)

Original prompt

Add a new workouts screen

[Variant 1 of 3]

The user has attached the following files as relevant context:

• .github/instructions/run.instructions.md
• .github/copilot-instructions.md
• docs/memory.md

Created from VS Code via the GitHub Pull Request extension.

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