Respect charSpace when wrapping text with maxWidth

[cycsmail]

When maxWidth is set, doc.text() wraps via splitTextToSize(), but the per-call charSpace never reached the width measurement used for wrapping, so text wrapped as if charSpace were 0 and then overflowed maxWidth once the spacing was rendered.

• Forward charSpace from text() into splitTextToSize()
• Thread it through the per-paragraph options and add charSpace / fontSize per character in the standard-font width branch (same units the embedded-font branch already uses)
• Add a spec asserting wrapped lines fit within maxWidth and that a wider charSpace wraps into more lines

No public API change, so types/index.d.ts is untouched. The new spec fails without the fix and passes with it; npm run test-node passes (468 specs, 4 pre-existing pending) and prettier is clean on the changed files.

Fixes #3299