Wiresheet: Ctrl+click to select several links, delete them together

Ctrl+click toggles a link in the selection; Del or the link popup deletes
every selected link after one confirmation, as a single undoable step.
On a device, links the device refuses stay and are named in one warning.

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 = "0.0.0.162"
+VERSION = "0.0.0.163"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True
@@ -86,6 +86,8 @@ selected_canvas_tags = set()  # Every selected box, the one above included; Ctrl
 selected_tree_item_id = None  # Tracks the currently right-clicked Treeview item
 link_mark_element = None      # Component marked as a link endpoint via "Link Mark"
 selected_link_tag = None      # Canvas tag of the currently selected (red-highlighted) link wire
+selected_link_tags = []       # Every selected link wire, in picking order; Ctrl+click adds.
+                              # selected_link_tag is the last of these.
 unroutable_link_count = 0     # Links drawn as knobs because no wire could avoid a component
 meta_scale = DEFAULT_GRID_SIZE  # Pixels per meta coordinate step on the painted sheet
 zoom = 1.0                    # Scale the open sheet is painted at; 1.0 is one pixel per pixel