Merge pull request #7860 from dotCooCoo/feat/variables-data-set-box-rename

Variables: the Data Set box renames the current data set

docs/target-app-parity.md

@@ -802,6 +802,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - Variables: when no object is bound to a variable that the data set has a value for, for example after Import Data Sets… defines new variables without binding them, choosing the data set in the Variables panel or stepping to it with the panel's arrows shows a status message, and `dataset.select`, `dataset.next` and `dataset.prev` add the message to the reply as `warning`.
   - Variables: Lock Variables (`variable.lock`, in the Variables panel's bottom bar and menu) stops variables from being defined, deleted or renamed until they are unlocked, while objects can still be bound and unbound and data sets still change and apply; the lock is saved with the document.
   - Variables: the Variables panel lists its variables in three columns with headers (type, Variables, Objects), and a click on a header sorts the list by variable type, variable name or bound object name, with a second click reversing the order (`variable.sort`; `variable.list` follows the order), as the [Variable panel overview](https://helpx.adobe.com/illustrator/desktop/automate-visualize-data/automate-actions/variable-panel-overview.html) describes.
+  - Variables: the Data Set box at the top of the Variables panel takes typed text, and a new name entered there renames the current data set with `dataset.rename` in one undo step; the same name adds no undo step, an empty or taken name is refused with a status message, and the list button beside the box still chooses a data set.
   - Batch…: Override Save and Override Export name each file with the extension of the format the step writes, however the step spells the format (`.svg` and `SVG` give `.svg`, `png8` gives `.png`), in `action.batch`.
   - Batch…: Override Export writes the files of an Export for Screens or Export Assets step into a folder for each source file or data set inside the destination folder, under the names the export gives them (`action.batch`). The folder and file names drop trailing periods and spaces (`a..svg` gives `a`). When two source files would get the same name that way (compared without case), or a later file's folder or file would take the name of an output an earlier file wrote, of a source file in the destination folder or, for data sets, of a file already there, Batch adds `-2`, `-3`… to the later one's name.
   - Batch…: when a step fails on a file or data set, the error names the step by its place in the action's steps, from 1, counting the Open steps the batch skips (`action.batch`). This numbering is VectorCraft's own rule. Tests `cmd::fileio::action_batch::tests::{a_folder_batch_error_names_the_step_in_the_commands_sent, a_recorded_open_that_fails_is_the_first_step, a_data_set_batch_error_names_the_step_in_the_commands_sent, a_redirected_export_that_fails_keeps_its_place, a_source_that_does_not_open_names_no_step}`.