fix(offset): handle curved self-intersections

Closes #544

Cargo.lock

@@ -19,6 +19,7 @@ dependencies = [
  "acadrust",
  "bincode",
  "bytemuck",
+ "cavalier_contours",
  "clap",
  "console_error_panic_hook",
  "cosmic-text",
@@ -898,6 +899,16 @@ dependencies = [
  "wayland-client",
 ]
 
+[[package]]
+name = "cavalier_contours"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31cab9e73a5a3533d3d6fb36818e8735dd033e080fa70a63d90846c8183708c9"
+dependencies = [
+ "num-traits",
+ "static_aabb2d_index",
+]
+
 [[package]]
 name = "cbc"
 version = "0.1.2"
@@ -3259,7 +3270,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b577e2d69827c4740cba2b52efaad1c4cc7c73042860b199710b3575c68438d"
 dependencies = [
  "bytecount",
- "memchr 1.0.2",
+ "memchr 2.8.3",
  "nom 8.0.0",
 ]
 
@@ -4768,7 +4779,7 @@ dependencies = [
  "security-framework",
  "security-framework-sys",
  "webpki-root-certs",
- "windows-sys 0.52.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -5278,6 +5289,15 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 
+[[package]]
+name = "static_aabb2d_index"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1204bd3057a2225dc60d157bd921aaeaa4d318527bd32af4678cad39e5279849"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "static_assertions"
 version = "1.1.0"
@@ -6920,7 +6940,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7d6f32a0ff4a9f6f01231eb2059cc85479330739333e0e58cadf03b6af2cca10"
 dependencies = [
  "cfg-if",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]