Right-to-left drawing text: bidi and Arabic-script shaping (Persian, Arabic, Urdu) (#315)

Squash of PR #315 by @vangel76.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Cargo.lock

@@ -631,7 +631,9 @@ name = "cadcraft-fonts"
 version = "0.5.0"
 dependencies = [
  "cadcraft-geom",
+ "harfrust",
  "skrifa 0.47.0",
+ "unicode-bidi",
 ]
 
 [[package]]
@@ -3731,6 +3733,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "unicode-bidi"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c1cb5db39152898a79168971543b1cb5020dff7fe43c8dc468b0885f5e29df5"
+
 [[package]]
 name = "unicode-general-category"
 version = "1.1.0"