feat(editor): F4.5b the device sheet for routers and home routers

Measured first: SheetRun now types into FILIUS' router and home router
panels, records five forwarding tables (holeTabelle) and steps in the
panel's table. Java turns a card address that passes the pattern but not
IP.ipCheck (".0.0.1") into null and the router panel throws; an empty
gateway is marked red yet taken; a refused table cell is stored as null;
a home router's DHCP client leaves its DHCP server running. None of the
nulls is adopted. The core's routeTableRows matches all five tables.

- doc: card addresses (the first card mirrored in the device's settings),
  router gateway, RIP, manual routes (a new row once all four cells pass,
  a cell, removal); the sheet reads cards with what their cable joins and
  the whole table
- editor: Java's tabs (general, each card titled by its address, the
  forwarding table greyed out under RIP; general, LAN, WAN on a home
  router); the open card's cable drawn active in Java's green

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

packages/editor/src/Editor.tsx

@@ -78,6 +78,8 @@ export function Editor({ doc }: { readonly doc: Y.Doc }) {
   const [menu, setMenu] = useState<{ readonly target: Selection; readonly at: Point } | null>(null);
   const [routerAt, setRouterAt] = useState<Point | null>(null);
   const [message, setMessage] = useState<string | null>(null);
+  // The cable of the card whose tab is open in the sheet (Java's Kabel.setAktiv).
+  const [highlightedLink, setHighlightedLink] = useState<string | null>(null);
 
   // A message goes after a while.
   useEffect(() => {
@@ -203,6 +205,7 @@ export function Editor({ doc }: { readonly doc: Y.Doc }) {
             onMoveEnd={() => manager?.stopCapturing()}
             onCableStart={setCableFrom}
             onCable={onCable}
+            highlightedLink={highlightedLink}
             onMenu={(target, at) => {
               setSelection(target);
               setMenu({ target, at });
@@ -247,7 +250,16 @@ export function Editor({ doc }: { readonly doc: Y.Doc }) {
         </div>
         {/* Java shows the settings of the device that is chosen; closing them lets go of it, as a click beside it does. */}
         {selected === undefined ? null : (
-          <DeviceSheet doc={doc} id={selected.id} label={selected.label} origin={origin} onChanged={() => manager?.stopCapturing()} onMessage={setMessage} onClose={() => setSelection(null)} />
+          <DeviceSheet
+            doc={doc}
+            id={selected.id}
+            label={selected.label}
+            origin={origin}
+            onChanged={() => manager?.stopCapturing()}
+            onMessage={setMessage}
+            onHighlight={setHighlightedLink}
+            onClose={() => setSelection(null)}
+          />
         )}
       </div>
     </div>