Feature: allow writing jc="distribute" via format.paragraph.setAlignment (model already reads 'distributed')

[palmoni5]

Summary

format.paragraph.setAlignment only accepts PARAGRAPH_ALIGNMENTS = ['left', 'center', 'right', 'justify'] (document-api/src/paragraphs/paragraphs.types.d.ts), so there is no way to write w:jc="distribute".

The model already reads it: types/paragraph.types.d.ts has alignment?: ... | 'distributed' and types/sd-props.d.ts lists 'distributed' | 'thaiDistribute' | .... A document that comes in with distribute round-trips, but an integrator cannot set it.

Use case

Hebrew religious-text typesetting conventionally justifies every line including the last one ("Distributed" in Word's Paragraph dialog). The de-facto Word tooling used by editors of these texts sets wdAlignParagraphDistribute on body paragraphs. We are porting that tooling to SuperDoc and this is the one alignment we cannot produce.

Expected

• Write side: format.paragraph.setAlignment({ target, alignment: 'distribute' }) (or 'distributed', matching the read-side name), emitting <w:jc w:val="distribute"/>.
• Layout: the last line is stretched like the other lines when jc=distribute (i.e. ResolvedTextLineItem.skipJustify would be false for the last line in that mode).

thaiDistribute and the kashida variants are out of scope here; distribute alone covers the Hebrew case.

Versions

superdoc@2.10.0 and 2.11.0 — PARAGRAPH_ALIGNMENTS unchanged.

[linear-code]

IT-1580