feat: F4.6f2 the text editor on the document's Y.Text, files both ways while the simulation runs

Oracle TextEditorWindowRun uses Java's text editor window and its file
dialog as a person does. The open file's text is its Y.Text in the
document (plan 7.3): typed is in the file at once, for everyone and for
the running engine. Core openText/saveTextAs without Java's mistakes
(lost saves after save-as onto a file or a removed file, files named
'ordner/d.txt' or ''); doc files.ts (changeFiles, fileText, nodeFiles,
readFilesInto); the room takes a person's files into the engine at once
and writes the engine's files back at the tick they changed; the editor's
window, Java's dialog, the text area following others' changes with the
caret in place, its own undo.

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

packages/editor/test/i18n.test.ts

@@ -23,6 +23,18 @@ function properties(file: string): Map<string, string> {
 /** The editor's keys whose words are Java's, and the key of each in Java's bundle. */
 const FROM_JAVA: Readonly<Record<string, string>> = {
   'device.pc': 'hw_rechner_msg1',
+  'textEditor.new': 'texteditor_msg3',
+  'textEditor.open': 'texteditor_msg4',
+  'textEditor.save': 'texteditor_msg5',
+  'textEditor.saveAs': 'texteditor_msg6',
+  'fileDialog.up': 'dmtnfilechooser_msg1',
+  'fileDialog.name': 'dmtnfilechooser_msg2',
+  'fileDialog.cancel': 'dmtnfilechooser_msg4',
+  'fileDialog.saveTitle': 'dmtnfilechooser_msg5',
+  'fileDialog.save': 'dmtnfilechooser_msg6',
+  'fileDialog.openTitle': 'dmtnfilechooser_msg7',
+  'fileDialog.open': 'dmtnfilechooser_msg8',
+  'fileDialog.folder': 'dmtnfilechooser_msg11',
   'device.notebook': 'hw_notebook_msg1',
   'device.networkSwitch': 'hw_switch_msg1',
   'device.router': 'hw_vermittlungsrechner_msg1',