Respect selected layer and visibility in Move Components picker

[anil08607]

Summary

Fixes the Move Components picker so it only selects components that should be interactable in the current view.

The picker now:

• respects the selected copper layer when deciding which component can be picked
• respects top/bottom component visibility state when that state is provided
• keeps layerless / through-hole style components pickable from either side

Changes

• added a small shared predicate for component pickability
• updated EditPlacementOverlay to filter hit-test candidates before starting a drag
• replaced the previous loose store access with explicit typed store state for top/bottom component visibility
• cleaned up the overlay logic with a named selector and named hit-padding constant

Testing

• bun test tests/lib/should-pick-pcb-component.test.ts
• targeted tsc --noEmit on the touched files

Notes

• layerless components are still treated as side-agnostic so through-hole parts remain movable
• top/bottom component visibility defaults to true, so existing consumers keep current behavior unless they explicitly control those flags

close #757

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Project	Deployment	Actions	Updated (UTC)
pcb-viewer	Ready	Preview, Comment	May 23, 2026 3:29pm