Type: Alt+arrow spacing steps turn with vertical type

In vertical type, Alt+Down/Up (with or without Shift) steps kerning at a
caret or tracking of selected text, Alt+Left/Right steps leading, and
Alt+Shift+Right/Left steps baseline shift; Cmd/Ctrl makes five steps.
Horizontal type keeps its mapping. Selected type objects follow the same
rule when all of them are vertical, and a selection that mixes horizontal
and vertical type takes the horizontal mapping in one undo step.

docs/mcp.md

@@ -3173,8 +3173,10 @@ Pen's second anchor at (150, 431), in line with the square's centre.
   Cmd+Shift+,) step the size. `type.size.increaseByFive` (Cmd+Alt+Shift+., `press_key {key: ".", mods: {cmd: true,
   alt: true, shift: true}}`) and `type.size.decreaseByFive` (Cmd+Alt+Shift+,) step it by five times `typeSizeIncrement`.
   The Type tool's Alt+arrows (`press_key {key: "Right", mods: {alt: true}}`) step kerning at
-  a caret or tracking of the selection (←/→), leading (↑/↓) and baseline shift (Shift+↑/↓), five steps with Cmd/Ctrl
-  too. `type.resetTracking` (Cmd+Alt+Q, `press_key {key: "Q", mods: {cmd: true, alt: true}}`) sets tracking to 0 and
+  a caret or tracking of the selection (←/→ in horizontal type, ↓/↑ with or without Shift in vertical type),
+  leading (↑/↓ in horizontal type, ←/→ in vertical type), and baseline shift (Shift+↑/↓ in horizontal type,
+  Shift+→/← in vertical type). Mixed selected text objects use the horizontal mapping; Cmd/Ctrl makes five steps.
+  `type.resetTracking` (Cmd+Alt+Q, `press_key {key: "Q", mods: {cmd: true, alt: true}}`) sets tracking to 0 and
   kerning to Auto in the type objects in `ids`, the Type tool's selected text or the selected type objects; at a caret
   it resets only the kerning of the character before it. `type.resetHorizontalScale` (Cmd+Shift+X,
   `press_key {key: "X", mods: {cmd: true, shift: true}}`) sets the horizontal scale to 100%, as the Character panel

docs/target-app-parity.md

@@ -814,6 +814,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
     With anchors or segments of a path selected with Direct Selection, Simplify acts on just that part of the path, as the [Manually simplify paths](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/manually-simplify-paths.html) page puts it: the slider, Auto-Simplify and the dialog refit only each run of selected segments, between its end anchors, which keep their place and their handles on the side away from the run. The anchors and segments outside the runs stay exactly as they were, a closed path's run may cross its start point, separate runs on one path are refitted independently in one undo step, and the runs stay selected. A path with only lone anchors selected is still simplified whole, and `object.path.simplify {wholePaths: true}` simplifies partly selected paths whole. Tests: `crates/engine/src/tests/simplify_part.rs` and `simplify_slider_and_dialog_simplify_only_the_direct_selected_part_of_a_path`.
     Object › Path › Smooth… (#4115) opens a slider under the selection from Minimum to Maximum smoothing with an Auto-Smooth button, as the [Smooth slider](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/refine-path-segments-with-the-smooth-slider.html) page describes; the canvas previews it and Enter or a click outside keeps it as one undo step (`object.path.smooth {level, auto, ids}`). The page names only the ends, so the rest is VectorCraft's own rule: each selected path, compound path members included, is refitted with curves within 0.1% (level 0) to 2.5% (level 100) of its longer side, corners kept only where it turns back and never with more anchors (a rectangle stays as it is); Auto-Smooth is level 50. Closed paths stay closed and open ones keep their end points. Tests: `crates/engine/src/tests/smooth_path.rs` and `smooth_slider_previews_auto_smooth_and_keeps_the_result`.
 - **Devanagari shaping:** with an OpenType Devanagari font, Ka, virama and Ssa (क्ष) form one conjunct glyph, Ra and virama before a consonant (र्क) become a reph drawn after it, the i matra (कि) is drawn before its consonant, and Ka with a nukta is drawn like the precomposed क़ (U+0958), as [Microsoft's Devanagari shaping specification](https://learn.microsoft.com/en-us/typography/script-development/devanagari) describes. Each syllable is one cluster of its source bytes, and the arrow keys stop at its ends. A click inside a syllable drawn with several glyphs puts the caret at the syllable's nearer end, in point, area and path type. Tests: `crates/text/src/tests/devanagari.rs`; they print SKIPPED when no such font is installed.
+- **Vertical type spacing shortcuts:** The [Default keyboard shortcuts](https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html) page gives Alt+Down/Up for kerning at a caret or tracking of selected text, Alt+Left/Right for leading, and Alt+Shift+Right/Left for baseline shift. Alt+Shift+Down/Up also steps kerning or tracking. Down increases kerning or tracking, Left increases leading, and Shift+Right increases baseline shift; the opposite arrows decrease them. Cmd/Ctrl makes five steps. Horizontal type keeps its existing mapping; mixed horizontal and vertical text-object selections take the horizontal mapping for both objects in one undo step. Selected vertical point, area and path type use the same directions. Tests: `spacing_arrows_follow_each_text_objects_orientation`, `alt_arrows_rotate_for_selected_vertical_type`, `mixed_type_objects_take_horizontal_spacing_chords_in_both_orders`, and `selected_vertical_area_and_path_type_use_vertical_spacing_chords`.
 - **Vertical punctuation:** fullwidth `！` (U+FF01) and `？` (U+FF1F) use their nominal glyph upright when no vertical alternate is present, following the Tu fallback in [Unicode UAX #50 §3.1](https://www.unicode.org/reports/tr50/#vo). Code-built test fonts cover point and area type with and without `vert` alternates, retain the rotated fallback for a bracket and long vowel mark, and leave horizontal type unchanged. Tests: `crates/text/src/tests/vertical.rs`.
   - Free Distort's dialog (Effect › Distort & Transform › Free Distort…) shows a box in the proportions of the first selected object's bounds with a handle on each corner. Dragging a handle moves that corner. A handle focused by a click or Tab moves 1% of the box with each arrow key, and 10% with Shift. Reset puts the four corners back on the box. The preview and OK run `effect.apply`, or `effect.setParams` when the dialog edits an applied effect, and the Appearance panel's inline editor opens the dialog with Edit…. Behavior reference: Illustrator CC Help (2014, [PDF](https://help.adobe.com/archive/en/illustrator/cc/2014/illustrator_reference.pdf)), page 285 (PDF page 291).
 - **Kerning across style runs:** characters that differ only in fill, stroke, underline, strikethrough, overprint, character style name, leading, baseline shift, rotation, Character Alignment, kerning, or tracking that keeps or drops ligatures alike are shaped together, so restyling one character keeps the font's kerning pairs with its neighbors. A character with manual kerning that follows one with automatic kerning keeps the font's kerning with it (unless All Caps or Small Caps sets it as two letters, as ß becomes SS), and its value replaces the font's kerning after it. A ligature does not form across a change of style, and a change of font, size or OpenType features still shapes the characters apart. Behavior reference: [Line and character spacing](https://web.archive.org/web/20260916050333/https://helpx.adobe.com/illustrator/using/line-character-spacing.html) (public documentation). Tests: `crates/text/src/tests/typo.rs`, `crates/text/src/tests/bidi.rs`.