feat(editor): F4.5e a router's connections in the device sheet

SheetRun now clicks through Java's JConnectionsDialog with a router, a
computer and a switch cabled in the GUIContainer: a click marks a card,
the same click unmarks it, another card swaps the cables or moves the
one; "+" adds 192.168.0.10/24 up to eight cards, "-" removes the last
card with its cable down to none, and a router without a card keeps no
gateway.

The document adds, removes and swaps a router's cards (the same cables,
the same devices), Java's click logic is one function for the test and
the page, and the sheet names the address at a cable's far end. The
page "Verbindungen verwalten" shows Java's RJ45 buttons in Java's
colours with each card's far end below. Not adopted: the last card
stays. A card tab or a mark whose card is undone away falls back.

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

packages/editor/src/i18n/en.json

@@ -11,6 +11,13 @@
   "cable.wanOccupied": "WAN port (external) already occupied!",
   "cable.wirelessNotPossible": "Wireless connection not possible",
   "canvas.label": "Network",
+  "connections.add": "Add interface",
+  "connections.fewest": "One interface always stays.",
+  "connections.hint": "Note: For reorganising cable connections:\n1. Choose cable connection by clicking the button next to the interface name\n2. Choose new interface by clicking according button\nIf the target interface is already occupied by another connection, then those cables will be swapped.",
+  "connections.local": "Local interfaces",
+  "connections.most": "At most 8 interfaces supported!",
+  "connections.nic": "NIC {number}: {address}",
+  "connections.remove": "Remove interface",
   "design.actions": "Actions",
   "design.palette": "Components",
   "design.redo": "Redo",
@@ -88,6 +95,7 @@
   "sheet.cloud": "Display as Cloud",
   "sheet.connectedTo": "Connected to {device}",
   "sheet.connection": "Connection",
+  "sheet.connections": "Manage connections",
   "sheet.defaultGateway": "Gateway",
   "sheet.deleteEntry": "Delete entry",
   "sheet.dhcpClient": "Use DHCP for configuration",