Add workouts list view with status filtering

[Copilot]

Adds a navigable workouts list screen to display all saved workouts with filtering capabilities.

Implementation

• WorkoutsListView: New SwiftUI view displaying workouts from WorkoutManager with segmented control filtering (All/Scheduled/Completed/Skipped). Includes empty states and status-coded icons.
• ContentView: Added navigation link "My Workouts" between existing Training Plan and AI Generator links.
• WorkoutStatusFilter: Enum defining filter states with display names for the segmented control.

Testing

• Unit tests: WorkoutManager CRUD operations, status filtering, workout calculations (duration, average power)
• UI tests: Navigation flow and filter control accessibility

Example Usage

// Filter workouts by status
private var filteredWorkouts: [Workout] {
    switch selectedFilter {
    case .all: return workouts
    case .scheduled: return workouts.filter { $0.status == .scheduled }
    case .completed: return workouts.filter { $0.status == .completed }
    case .skipped: return workouts.filter { $0.status == .skipped }
    }
}

Screen displays workout metadata (title, date, duration, average power) with navigation to existing WorkoutDetailView. Fully accessible with VoiceOver labels.

Original prompt

Add a new workouts screen

[Variant 2 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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