fix(layout): correct Arabic/RTL font sizing, indent direction & mirroring

[dawidbudaszewski]

Summary

Three related complex-script (RTL) rendering fixes that align SuperDoc with Word / Pages / Google Docs, in both the editable and paginated layout-engine paths:

• Complex-script font size & face — runs flagged complex-script (w:rtl / w:cs) now render from w:szCs and the w:rFonts w:cs slot (e.g. Qatar3), instead of falling back to the Latin w:sz / ascii font (often a generator-emitted 12pt Times). Editable: super-converter/styles.js; layout: layout-adapter/attributes/paragraph.ts.
• Direction-aware indentation — resolves OOXML logical w:start/w:end vs physical w:left/w:right against paragraph direction, so an RTL indent lands on the correct visual edge. Fixes RTL signature blocks collapsing/wrapping under w:jc="both" (encodeCSSFromPPr).
• RTL indent mirroring — mirrorIndentForRtl now only swaps left/right and no longer negates firstLine/hanging, fixing the first-line outdent in the paginated layout engine (bidi.ts).

Test plan

• image/bidi/paragraph/styles unit tests updated and green
• Verify Arabic letter (Qatar MoFA template) renders at correct szCs size + cs font in editable and paginated views
• Verify RTL signature block fits on one line (no wrap/justify gaps)
• Verify first line of RTL paragraphs indents inward (not outdented) with layout engine on

Part of the @scale fork release (SCALE_BRANCHES).

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