Fix input handling and map popup light-dismiss

[emosaru]

Summary

• MaskInput: TrackableItemControl now uses standard Image (rectangular hit test) by default, only switching to InputMaskingImage (per-pixel alpha hit test) when MaskInput is true
• IgnoreUserInput: Enforced at three levels — IsHitTestVisible binding on the outer Grid, CanExecute checks on both left/right click commands, and an early guard in Grid_PointerReleased
• Map popup light-dismiss: Location details popup now closes on clicks anywhere in the window (not just within the map control) using a tunneling PointerPressed handler on the top-level window, fixing the issue where clicking items outside the map wouldn't dismiss the popup

Test plan

• Load a pack with MaskInput items — verify per-pixel alpha hit testing works only on those items
• Verify items with IgnoreUserInput=true cannot be clicked (left or right)
• Open a map location popup, then click on a tracker item — popup should close
• Open a map location popup, click on another map location — popup should switch to new location
• Double-click a map location — should still pin correctly
• Rapid pack switching — no crashes or stale handlers

🤖 Generated with Claude Code