Tabs: the ruler's indent markers set the first-line and left indents

The Tabs panel's ruler shows an upper marker at the first line's position
(left indent plus first-line indent) and a lower marker at the left
indent. Dragging the upper marker sets the first-line indent. Dragging the
lower marker sets the left indent and keeps each paragraph's first line
where it was; Ctrl-dragging it (Command on macOS) moves both markers.
Marker drags land on whole points, or on ruler ticks with Snap to Unit or
Shift, and each release is one undo step through text.setFormat. With a
marker selected, the X (or Y) field shows and sets its position.

When the touched paragraphs have different left indents, only the upper
marker is shown, and its position applies to every touched paragraph.

docs/target-app-parity.md

@@ -855,6 +855,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   In vertical type, the Tabs panel names its alignment buttons Top-Justified Tab, Center-Justified Tab, Bottom-Justified Tab and Decimal-Justified Tab, in their tool tips and for screen readers, and labels the position field Y. In horizontal type the buttons keep the names Left-Justified Tab and Right-Justified Tab, and the field keeps the label X.
   The Tabs panel's ruler is numbered in the General unit with the canvas rulers' label steps and a tick every tenth of a step. With the panel menu's Snap to Unit on, or Shift held, a tab stop placed by a click on the ruler or dragged on it lands on the nearest tick (`text.tabs.set`).
   With Snap to Unit off and Shift not held, a tab stop placed by a click on the Tabs panel's ruler or dragged on it lands on the nearest whole point. A position typed in the X or Y field keeps its hundredths of a point.
+  The Tabs ruler's upper first-line marker and lower left-indent marker show absolute positions and set paragraph indents (`text.setFormat`). Dragging the lower marker keeps the upper position, while Ctrl-dragging it (Command on macOS) moves both; marker drags snap like tab stops, and each release is one undo step. With differing left indents, only the upper marker is shown and its absolute target applies to every touched paragraph.
   When a drag on the Tabs panel's ruler or a value typed in its X field moves a tab stop past another stop, the moved stop stays selected.
   The Tabs panel menu's Clear All Tabs (`text.tabs.clear`), Delete Tab and Repeat Tab (`text.tabs.set`) can be chosen while the panel's ruler shows tab stops. Delete Tab removes the stop selected on the ruler. Repeat Tab replaces the stops after the selected stop with up to 20 copies of it. The copies are spaced by the selected stop's distance from the stop before it, or from the paragraph's left indent when it is the first stop, and no copy is placed at 2,000 pt or beyond. Clear All Tabs removes every stop, so the default stops every ½ inch apply again.
 - **Interface languages, vertical type:** Preferences ▸ User Interface (or VectorCraft ▸ Language on macOS) picks Automatic (the system locale) or a registered language, persisted as `interfaceLanguage`. Translations come from per-language catalogs (`i18n/*.tsv`): Traditional and Simplified Chinese, Japanese, German (every `de-*` locale), Spanish (neutral international Spanish, for every `es-*` locale), French (every `fr-*` locale), Italian (every `it-*` locale), Russian (every `ru-*` locale) and Ukrainian (every `uk-*` locale), Catalan (every `ca-*` locale) and Polish (every `pl-*` locale; AI-drafted, native review pending) cover the whole interface, Czech every menu label; Czech, German, Greek, Spanish, French, Hungarian, Italian, Japanese, Korean, Vietnamese, Polish, Brazilian Portuguese, Russian, Simplified Chinese, Traditional Chinese, Swedish, Ukrainian and Finnish also translate status-bar and error messages as they are shown (`@msg` templates, every message literal tested; the messages themselves stay English for agents); untranslated text stays English. Japanese and Chinese glyphs come from the craft-fonts build input (release builds) or the installed fonts, Czech, German, Spanish, French, Italian, Russian and Ukrainian ones from the bundled UI fonts. The web app follows the browser's languages (or `?lang=`). The Basic toolbar's Type button holds Vertical Type in its flyout. Vertical Type, Vertical Area Type and Vertical Type on a Path create vertical text (columns right to left, upright CJK glyphs and marks with `vert` alternates, Latin and longer numbers on their side, two- and three-digit numbers set as tate-chu-yoko in one em of the column (kept whole when justified), upright glyphs centred on the column (tracked or justified too), point type's anchor on the first column's centre line); kinsoku applies to horizontal and vertical Japanese (Paragraph panel › Kinsoku Set, `text.setFormat {kinsoku}`: Hard, the default, keeps closing marks, iteration marks, the prolonged sound mark and small kana off the line start and opening brackets off its end; Soft lets 々, ー and small kana start a line as JLREQ's level 3 rules do; None turns it off), and justified Japanese lines spread their room between characters (not inside Latin words); Paragraph panel › Mojikumi Set (shown with Preferences › Type › Show East Asian Options, `text.setFormat {mojikumi}`): None or Line-end Punctuation Half Width (new type's default, as in Illustrator; older documents and imported text keep None) shares one half-em space between consecutive punctuation, sets a closing mark ending a line half width and an opening bracket starting a line flush with its start (a paragraph's first line at its first-line indent, JIS X 4051's principle in JLREQ 3.1.5), and puts a quarter em between Japanese and Latin letters or digits; Paragraph panel menu › Top-to-Top / Bottom-to-Bottom Leading measures leading from em box top to top (area type's first line touches the frame) or from baseline to baseline (new type in a Japanese interface starts top to top, with em box centre character alignment, #432); Paragraph panel menu › Burasagari None / Regular / Force (`text.setFormat {burasagari: "none"|"standard"|"forced"}`) hangs an East Asian comma or full stop (、。，．､｡) ending an area type line outside it, Regular (new type's default) when it doesn't fit and Force always (the rest of the line then fills the measure; closing brackets and Latin punctuation don't hang); Character panel menu › Character Alignment (with the East Asian options; `text.setFormat` or `text.setRangeStyle {charAlign}`) lines characters smaller than the largest on their line up on the Roman baseline, the em box top/right, centre or bottom/left, or the ICF (ideographic character face) top/right or bottom/left, from the font's BASE table or, without one, the average ink box of some ideographs and kana; Proportional Metrics (the same menu; `{proportionalMetrics}`) sets full-width glyphs on the font's proportional widths (OpenType `palt`) in horizontal type and upright glyphs on its proportional heights (`vpal`, shaped top to bottom; fonts without vertical metrics keep their cells) in vertical type, and Line-end Punctuation Half Width takes nothing more off the punctuation they re-spaced; Type ▸ Type Orientation switches existing text; caret, selection, hit testing and arrow keys follow the writing direction. Vertical text exports to PDF as real text and to SVG as outlines. The interface is available in Polish (`pl`): menus, panels, dialogs and messages, with one/few/many plurals; AI-drafted, native review pending (#1498).