Tablet responsive layout implementation

[Copilot]

Implements responsive design system for tablet support using Material 3 breakpoints (Compact <600dp, Medium 600-840dp, Expanded >840dp).

Core Infrastructure

• WindowSizeClass utility - Provides LocalWindowSizeClass composition local and breakpoint detection
• ResponsiveDimensions helpers - Reusable scaling functions for charts (1.25x/1.5x), cards (max width constraints), and components (1.3x/1.6x)
• EnhancedMainScreen integration - Wraps app in BoxWithConstraints + CompositionLocalProvider to propagate window size

UI Adaptations

Screens (15+): HomeScreen, AnalyticsScreen, WorkoutHud, BadgesScreen, InsightsTab, WorkoutTab/Alt, ConnectionLogsScreen, DayCountPickerScreen, CountdownCard

Charts (6): AreaChart, CircleChart, ComboChart, GaugeChart, RadarChart, VolumeTrendChart - all use ResponsiveDimensions.chartHeight()

Components: RoutinePickerDialog, AutoStopOverlay, AnimatedActionButton, ProfileSidePanel, ShimmerEffect skeletons

Example pattern:

// Charts scale height
val chartHeight = ResponsiveDimensions.chartHeight(baseHeight = 200.dp)

// Cards constrain max width on tablets
ResponsiveCardWrapper {
    InsightCard(modifier = Modifier.fillMaxWidth())
}

// Components scale proportionally
val hudSize = ResponsiveDimensions.componentSize(baseSize = 200.dp)

Database

Migration 6 adds Training Cycles feature tables (TrainingCycle, CycleDay, CycleProgress, CycleProgression, PlannedSet, CompletedSet, ProgressionEvent) with resilient migration handling via CREATE TABLE IF NOT EXISTS.

Coverage

21 files adapted, responsive utilities consistently applied across presentation layer.

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