Type: Hebrew and Arabic text laid out right to left (bidi), aligned by its direction

- Unicode bidi (unicode-bidi, unicode-script, unicode-general-category):
  each paragraph's direction from its first strong character, Hebrew and
  Arabic shaped right to left, embedded Latin and numbers keep theirs,
  lines wrapped in logical order and reordered per line by whole
  clusters; source text, undo and style ranges stay logical.
- Caret, hit testing, selection and the arrow keys follow the visual
  order.
- New text aligns automatically: right-to-left paragraphs right, others
  left (Justify::Auto, text.setStyle {justify: "auto"}); the Paragraph
  panel highlights the resolved alignment and has an Automatic alignment
  toggle. Explicit alignments, and older documents', are kept.
- SVG export outlines bidirectional text (with a warning) until it can
  be written as directional live text.

docs/development.md

@@ -179,3 +179,27 @@ Untrusted input has property tests that must never panic:
 CI runs a few dozen cases each. Before touching an importer, run a deeper search, e.g.
 `PROPTEST_CASES=20000 cargo test --release -p vectorcraft-engine --test import_fuzz`. When it finds a
 panic, fix the code and add the input as a regular test.
+
+## Bidirectional type (M7.RTL)
+
+Horizontal point, area and path text automatically resolve paragraph direction using Unicode
+first-strong detection. Hebrew and Arabic runs shape right to left; embedded Latin and numbers
+retain their direction. Wrapping happens in logical order, followed by visual ordering of whole
+shaping clusters. Text commands, pasted text and the Type tool use the same layout; stored text,
+undo and style byte ranges remain in logical order. New text defaults to automatic alignment:
+Hebrew/Arabic paragraphs align right and grow left from a point anchor, while LTR paragraphs
+align left. Alignment is resolved again during edits and independently for each paragraph.
+The Paragraph panel highlights the resolved alignment and provides an Automatic alignment toggle.
+Explicit Left/Center/Right choices override detection; `text.setStyle {justify: "auto"}` restores
+automatic mode. Saved documents retain the mode; existing explicit alignments are preserved.
+
+Combining marks stay with their bases and Arabic uses the font's contextual forms and ligatures.
+Use an installed font covering the script; no new fonts are bundled. Web builds need a font with
+Hebrew/Arabic coverage supplied through the existing font setup. SVG export outlines bidirectional
+text to preserve its appearance; native files retain editable text. PDF and raster exports use the
+same positioned glyphs as the canvas.
+
+Remaining refinements: explicit paragraph direction overrides, dual caret affinity at mixed-direction
+boundaries, RTL tab-stop conventions, and editable bidirectional SVG export. Vertical type retains
+its existing logical column order. Unicode direction detection is script based, not a language or
+keyboard-layout classifier.