feat(terminal/osc12): define cursor color through style of cell that describes the cursor position

The `.default` color will reset the cursor color to the terminal's default color

src/element.zig

@@ -519,9 +519,13 @@ pub fn Input(Model: type, Event: type, Queue: type) fn (meta.FieldEnum(Event)) t
                 /// Configuration for InputField's.
                 pub const Configuration = packed struct {
                     color: Color,
+                    cursor: Color,
 
-                    pub fn init(color: Color) @This() {
-                        return .{ .color = color };
+                    pub fn init(color: Color, cursor: Color) @This() {
+                        return .{
+                            .color = color,
+                            .cursor = cursor,
+                        };
                     }
                 };
 
@@ -680,10 +684,13 @@ pub fn Input(Model: type, Event: type, Queue: type) fn (meta.FieldEnum(Event)) t
                             break;
                         }
                     }
-                    if (this.input.items.len < cells.len)
-                        cells[this.input.items.len - this.cursor_offset].style.cursor = true
-                    else
+                    if (this.input.items.len < cells.len) {
+                        cells[this.input.items.len - this.cursor_offset].style.cursor = true;
+                        cells[this.input.items.len - this.cursor_offset].style.cursor_color = this.configuration.cursor;
+                    } else {
                         cells[this.input.items.len - offset - this.cursor_offset].style.cursor = true;
+                        cells[this.input.items.len - offset - this.cursor_offset].style.cursor_color = this.configuration.cursor;
+                    }
                 }
             };
         }
@@ -1615,7 +1622,7 @@ test "input element" {
     };
     var queue: Queue = .{};
 
-    var input_element: Input(Model, Event, Queue)(.accept) = .init(allocator, &queue, .init(.black));
+    var input_element: Input(Model, Event, Queue)(.accept) = .init(allocator, &queue, .init(.black, .default));
     defer input_element.deinit();
 
     const input_container: Container(Model, Event) = try .init(allocator, .{