Add Via Net Assign feature

Iterates all vias in the active selection and assigns each one to the
net of the nearest copper item (track or pad) on the board. Intended
for re-using via layouts after copying traces to a new net.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/layout_replicator/__init__.py

@@ -2,6 +2,8 @@ import pcbnew
 import wx
 import traceback
 
+from .via_net_assign import Via_Net_Assign_Action
+
 
 # ---------------------------------------------------------------------------
 # Board helpers
@@ -241,3 +243,4 @@ class Layout_Replicator_Action(pcbnew.ActionPlugin):
 			dlg.Destroy()
 
 Layout_Replicator_Action().register()
+Via_Net_Assign_Action().register()