feat(editor): the simulation's properties in a sheet of their own, with a restart for everyone

Who started the simulation, "Pakete verwerfen" and the dropped packets move
from the toolbar into a properties sheet beside the surface. New in it: restart
the simulation, after asking. The room learns a restart message: stopped as by
stop, every capture, dropped frame and program window emptied, started anew
and named after who restarted; refused for readers and frozen projects, logged,
and waiting for asked blobs like a start.

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

tools/live/acceptance.ts

@@ -97,6 +97,8 @@ try {
 
   // Mia starts; the simulation runs for both, named after her.
   await mia.locator('button[name="simulationMode"]').click();
+  await eventually('the simulation runs for Ben', async () => (await canvas(ben).getAttribute('data-mode')) === 'simulation');
+  await ben.getByRole('button', { name: 'Eigenschaften' }).click();
   await eventually(
     'the simulation runs for both, started by Mia',
     async () => (await canvas(ben).getAttribute('data-mode')) === 'simulation' && (await ben.locator('[data-note="startedBy"]').textContent()) === 'Simulation gestartet von Mia',