Wiresheet wires: rounded bends, hops, junction dots and grid spacing

Wires now round their bends, hop over the wires they cross, and show a dot
where wires from one output split. Wires sharing a pin may share a trunk.

Routes keep one grid square from a box's top and bottom and two from its
sides, never turn closer than two squares beside a box, and keep half a
square from other wires. The runs pinned to every slot are claimed before
any wire is routed, so an early wire no longer lays its run along a row a
later slot has to leave by. A wire that cannot fit the grid spacing falls
back to the old tighter one rather than turning into knobs.

The styling geometry lives in wire_style.py; draw_links is split into
collecting, routing and painting around a WireJob dataclass.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.160"
+VERSION = "0.0.0.161"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True