Fix an assortment of small bugs (#3968)

* Fix an assertion failure bug when scaling a line in the transform cage

* Fix missing defaults on node gradient inputs

* Fix Blend Shapes path input wire not updating to show in the UI after Layer > Blend

* Fix assertion failure due to browser non-monotonic timestamp

* Fix SVG renderer drawing 1px strokes as half-width when using stroke alignment

* Fix incorrect appearance of the ColorInput widget when set to "none" and "disabled"

* Fix lerp function in Fill enum to handle None cases correctly

* Fix stroke alignment bug

frontend/src/components/widgets/inputs/ColorInput.svelte

@@ -116,7 +116,7 @@
 			background-repeat: var(--color-transparent-checkered-background-repeat);
 		}
 
-		&:not(.disabled).none > button {
+		&.none > button {
 			background: var(--color-none);
 			background-repeat: var(--color-none-repeat);
 			background-position: var(--color-none-position);
@@ -132,6 +132,7 @@
 			left: 0;
 			right: 0;
 			background: var(--color-4-dimgray);
+			opacity: 0.5;
 		}
 
 		&:not(.disabled):hover > button .text-label,