Add a collider

Collider shapes get their own viewport interaction mode instead of raw number fields.

Steps

1. Select an entity and add a Collider from Add Component.
2. Pick the shape in the Collider Shape dropdown (Rect or Circle, default Rect). The editor remembers each shape's own last dimensions per entity, so switching back and forth loses neither.
3. Click Draw Collider, then press to anchor the shape and drag to grow it: a rect defines opposite corners, a circle's drag sets its radius from the anchor. Release to commit; Esc restores the previous shape.
4. Reset Collider zeroes the current shape's dimensions.

Drawing edits the live Collider component, so the translucent overlay every collider already has shows it updating in real time.

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