fix: shader fade animation linear curve

Plugins/ZShell/HyprPlugins/main.cpp

@@ -25,7 +25,6 @@ extern "C" {
 
 #include "colortemp.hpp"
 
-using ZShell::services::easeInOutCubic;
 using ZShell::services::kelvinToGain;
 
 using Render::IFramebuffer;
@@ -241,17 +240,16 @@ static void hkBegin(
 				.count();
 		const float t =
 			std::clamp(elapsed / g_transition.durationSec, 0.f, 1.f);
-		const float e = easeInOutCubic(t);
 
 		for (size_t i = 0; i < 3; ++i)
 			g_currentGain[i] =
 				g_transition.fromGain[i] +
-				(g_transition.toGain[i] - g_transition.fromGain[i]) * e;
+				(g_transition.toGain[i] - g_transition.fromGain[i]) * t;
 
 		if (g_uniformMode) {
 			setUniformGain(g_currentGain);
 		} else {
-			const int step = static_cast<int>(e * BAKED_STEPS);
+			const int step = static_cast<int>(t * BAKED_STEPS);
 			if (step != g_transition.lastBakedStep) {
 				g_transition.lastBakedStep = step;
 				ensureShaderFile(