feat(tui): add wrap-around navigation to all menus and move modes - #332

Summary

• Enable circular cursor movement across all TUI menus and lists — pressing up at the first item wraps to the last, and pressing down at the last wraps to the first
• Also applies to move/reorder modes, allowing items to be moved cyclically through list boundaries
• No existing PR covers this functionality

Changes

• List.tsx — change wrapNavigation default from false to true, enabling wrap-around for all <List>-based menus (MainMenu, InstallMenu, PowerlineSetup, etc.)
• input-handlers.ts — replace Math.max/Math.min clamping with wrap-around logic in handleNormalInputMode, handleMoveInputMode, and handlePickerInputMode
• PowerlineSeparatorEditor.tsx — wrap-around for separator list navigation
• LineSelector.tsx — wrap-around in line move mode

Test Plan

• 789 tests pass (10 new), TypeScript and ESLint clean
• New tests cover wrap boundaries for: normal mode (up/down), move mode (up/down), picker categories (up/down), picker widgets (up/down), and top-level search (up/down)