i18n: the History panel translates the undo step names the sources write as literals

The History panel looked up each step's name with tl!, which reads only
a plain catalog row. 95 of the 427 names that the engine, the tools and
the shell give their undo steps had no such row in at least one complete
catalog, and 83 had no row at all (Make Blend, New Guide, Pen, Reshape
Spine and others). A step named after an effect has the effect's menu
name without its ellipsis. For many effects, and for steps such as New
Layer, the catalogs hold that name only with the ellipsis. The panel
listed those steps in English.

Each complete catalog now has a row for every step name, written in the
catalog's own terms: 1,437 rows in the 19 catalogs. The History panel
reads a step's row, or else the row of the same name with an ellipsis,
without the ellipsis, and shows the name as recorded when the catalog
has neither. A new test reads the step names from the sources, as the
tl! and message tests read theirs, and requires a row for each in every
complete catalog.

Docs: docs/target-app-parity.md.

docs/target-app-parity.md

@@ -453,6 +453,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - The dock's double arrow collapses Properties, Layers and Libraries to icons at the top of the icon column, popping out like the other icon panels, and expands them again (`window.collapseDock`, kept with the preferences and in saved workspaces). The icon column's own arrow (expanding the icon panels into a full column) is not done.
   - Czech render-site labels: desktop/web file filters, diagnostics, suggested preset names and contributor tooltips/plurals now use catalog lookups; gradients have Czech adjective agreement and printer marks have a separate context (PDF/Print and Summary). Search, Home, toolbar/panel tooltips and Preferences already look up their labels. Every complete catalog has rows for these labels and for the Roman and Japanese printer mark styles. Evidence: `i18n::tests::czech_render_site_follow_up`, `i18n::tests::complete_catalogs_translate_render_site_labels`, `dialogs::tests_modal::printer_mark_labels_are_distinct_from_language_names`; see [localization-parity.md](localization-parity.md).
   - Localised UI: menus (in-window and native), panels, dialogs, toolbar and Preferences read from per-language catalogs (`crates/ui-egui/src/i18n`, see `docs/development.md`); Traditional Chinese (Taiwan), Simplified Chinese (mainland), Japanese, Korean, Vietnamese, German, Spanish, French, Italian, Polish, Brazilian Portuguese, Russian and Ukrainian ship complete, and Czech covers every menu label (and more), with system-locale detection on macOS, Windows, Linux and the web (the browser's languages, or `?lang=`), a Language preference and, on macOS, a VectorCraft ▸ Language menu. Names are never translated (fonts and their styles, layers, artboards, saved presets, user libraries, custom workspaces, recent files, plug-ins).
+  - The History panel translates the undo step names the engine, the tools and the shell write as literals: each has a row in every complete catalog (`every_undo_label_is_translated`), and a step whose catalog row exists only with an ellipsis (such as an effect's menu name) shows that row without the ellipsis.
   - Native macOS menu bar, vector tool cursors, a ⌘K command palette, middle-button panning with any tool. Native menus explicitly end tracking on command selection, outside window presses and Escape; menu updates wait until tracking ends, and a dismissing press never starts a canvas gesture (M14.8).
   - The errors of the blend spine commands (Move Spine Point, Reshape Spine Segment, Add Spine Point and Delete Spine Point) show in the status bar in the interface language: each has a row in every catalog that translates all status and error messages and in Bulgarian (`blend_spine_param_errors_are_translated`).
   - The macOS menu bar is built from the in-window menus (one model, `native_menu`) and laid out as a Mac app's: the VectorCraft menu holds About, Settings ▸ (each Preferences page, General… ⌘K), Language ▸, Appearance ▸ (UI brightness), Services, Hide VectorCraft ⌃⌘H (⌘H stays Hide Edges), Hide Others, Show All and Quit; Window gains Minimize ⌃⌘M, Zoom and Bring All to Front, and Help the system's search field. Its key equivalents go back to egui as key presses, so user shortcuts, focused text fields and the Type tool's input method behave as in the window, and nothing fires twice; enabled, check marks and labels update in place. `--in-window-menus` or `VECTORCRAFT_IN_WINDOW_MENUS=1` keeps the menus in the window; `ui.inspect` reports `nativeMenuBar`.