SVG Text: Arabic-Family Joining & Devanagari USE Reordering

The same real joining-form resolution, GSUB shaping, and USE syllable reordering as HTML text (see the two showcases above), now applied inside a native SVG <text> element.

Positional joining forms (Beh-Yeh-Teh, direction="rtl")بيتLam-alef ligature (rlig), direction="rtl"لاGPOS cursive attachment (Aref Ruqaa), direction="rtl"بيتالفDevanagari pre-base matra / conjunct / reph reorderingकि — क्षि — र्किMixed script: Latin, embedded Arabic, embedded Devanagari in one lineHello بيت कि