fix: RTL text fillText(maxWidth) x positioning calculation error

[yisibl]

The direction algorithm has been rewritten, most scenarios now align with the browser.

• Added more comprehensive test cases for direction
• Also fixed the bug where measureText.width returned different values in LRT and RTL layouts
  The solution is to use getMaxIntrinsicWidth instead of getRectsForRange, which also avoids manually iterating through glyph widths.

Part of #1172

---

Note

Reworks text direction layout to fix RTL x calculation and unify measureText.width across directions, and adds comprehensive direction/letter-spacing tests.

• Core text layout (skia-c/skia_c.cpp)
  • Use paragraph->getMaxIntrinsicWidth() for line_width (direction-independent, includes trailing spaces) instead of summing getRectsForRange().
  • Refactor paint_x/alignment logic: separate rtl_offset and letter_spacing_offset; compute center/right/start/end consistently; correct scaling interaction with maxWidth.
  • Adjust metrics outputs (left, right) to include letter-spacing offset; minor float literal and cleanup tweaks.
• Tests (__test__/text.spec.ts)
  • Expand direction coverage: alignment with/without maxWidth, save/restore, stroke with letterSpacing, negative letterSpacing, MDN example updates.
  • Add direction-measure-text ensuring measureText.width matches in LTR/RTL; refactor alignment test into drawDirectionAlignTest; tweak canvas sizes/fonts where needed.

^{Written by Cursor Bugbot for commit 6ff4761. This will update automatically on new commits. Configure here.}

[Brooooooklyn]

cursor review

[cursor]

✅ Bugbot reviewed your changes and found no bugs!