M4.54: Placing a text file asks for Text Import Options and sets it as area type

file.place of a .txt file takes `text: {characterSet: unicode|ansi, platform: windows|mac,
removeLineReturns, removeParagraphReturns, replaceSpaces}`: Unicode reads UTF-8 or UTF-16 by its
byte-order mark (other bytes as the platform's 8-bit set), ANSI reads Windows-1252 or Mac Roman;
CR LF, CR and LF all break lines; joining lines makes each block one paragraph, blank lines can
go, and runs of spaces can become tabs. The text becomes area type filling `rect`, the replaced
object's bounds, or the artboard less a 36 pt margin (type reflows rather than scaling), as one
undo step. The place cursor and file.place.info take text files too, and File → Place lists them.

In the app, placing a text file (the Place dialog, a drop, file.place without options) opens the
Text Import Options dialog. Its dropdown rows share a form helper with Document Setup.

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

docs/control-protocol.md

@@ -262,3 +262,8 @@ folder; `ui.dialog.set {field: "discard", value: true}` then confirm ignores it
 `applyToAll` the rest too. The next missing file is asked about after each answer; `ui.dialog.cancel` stops asking.
 Then, with the preference `updateLinks: "askWhenModified"`, modified linked files are offered for update in a
 `confirm` dialog whose `ui.dialog.confirm` runs `links.update`.
+
+Text Import Options: placing a `.txt` file through the app (`file.place` with a file and no `text` options, the Place
+dialog, a drop) opens the `textImport` dialog (fields `platform`: `windows`/`mac`, `characterSet`: `unicode`/`ansi`,
+`removeLineReturns`, `removeParagraphReturns`, `replaceSpaces`, `spaces`). `ui.dialog.confirm` places the file as area
+type with those options (`file.place {text: {…}}`).