feat: F4.6g1 the echo server and the generic client windows

Oracle EchoWindowRun uses Java's echo server and client windows as a
person does; SaveAfterRunRun echo saves what Java keeps after the run.
The room takes setActive with a port, connect/disconnect/send, sends
both views and writes the server's port and the client's target back.
The editor's windows show Java's buttons, fields and lines; a port that
is no port is marked and not handed over (Java's button throws).
Core fix: an empty message (one empty segment with the push, as Java's
erstelleSegmente makes) counted as a repeat and never arrived.

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

packages/editor/src/desktop/serverLines.ts

@@ -1,8 +1,10 @@
 // A server's lines as Java's server windows write them (ServerAnwendung,
-// ServerMitarbeiter, TCPSocket's failures), in the person's language: one
-// line each, as Java appends them to its window's text area.
+// ServerMitarbeiter, TCPSocket's failures), and the generic client's as its
+// window writes them (ClientBaustein, Socket, TCPSocket), in the person's
+// language: one line each (a failed connection two), as Java appends them to
+// its window's text area.
 
-import type { ServerLogEntry } from '@mdg-filius/core';
+import type { ServerLogEntry, SimpleClientLogEntry } from '@mdg-filius/core';
 import type { Translate } from '../i18n/i18n.js';
 
 export function serverLine(entry: ServerLogEntry, t: Translate): string {
@@ -23,3 +25,23 @@ export function serverLine(entry: ServerLogEntry, t: Translate): string {
       return t(`server.sendFailed.${entry.failure}`);
   }
 }
+
+export function simpleClientLine(entry: SimpleClientLogEntry, t: Translate): string {
+  switch (entry.kind) {
+    case 'connected':
+    case 'disconnected':
+    case 'notConnected':
+    case 'receiveFailed':
+      return t(`simpleClient.${entry.kind}`);
+    case 'connectFailed':
+      return `${t('simpleClient.notConnected')}\n${t(`simpleClient.failure.${entry.failure}`)}`;
+    case 'connectionClosed':
+      return t('simpleClient.connectionClosed', { address: `${entry.address}:${entry.port}` });
+    case 'received':
+      return `>>${entry.text}`;
+    case 'sent':
+      return `<<${entry.text}`;
+    case 'sendFailed':
+      return t(`server.sendFailed.${entry.failure}`);
+  }
+}