Revert "fix: sync imgui fps to stream fps to avoid it interferes with displaylink timings"

This reverts commit 5d1bed4d25.

Revert "fix: another attempt to fix occasional video freeze with metal renderer"

This reverts commit 958b391afa.

Revert "fix: attempt to fix occasional video freeze with metal renderer"

This reverts commit bcb4d0a905.

Revert "feat: use CAMetalDisplayLink for metal renderer to fix refresh rate issues"

This reverts commit 9e20efff4b.

Revert "Revert "MetalViewController: run a no-op DisplayLink at the target framerate so iOS won't switch to a slower rate""

This reverts commit 39b2621e30.

VoidLink/Database/TemporarySettings.m

@@ -52,15 +52,7 @@
     self.statsOverlay = [[NSUserDefaults standardUserDefaults] boolForKey:@"statsOverlay"];
     self.enableGraphs = [[NSUserDefaults standardUserDefaults] boolForKey:@"enableGraphs"];
     self.graphOpacity = [NSNumber numberWithInteger:[[NSUserDefaults standardUserDefaults] integerForKey:@"graphOpacity"]];
-    // Set rendering backend based on iOS version and user preference
-    NSInteger savedBackend = [[NSUserDefaults standardUserDefaults] integerForKey:@"renderingBackend"];
-    if (@available(iOS 17.0, *)) {
-        // iOS 17+ can use Performance mode (Metal renderer)
-        self.renderingBackend = [NSNumber numberWithInteger:savedBackend];
-    } else {
-        // iOS < 17 must use Balanced mode (AVSB renderer)
-        self.renderingBackend = [NSNumber numberWithInteger:RENDER_AVSB];
-    }
+    self.renderingBackend = [NSNumber numberWithInteger:[[NSUserDefaults standardUserDefaults] integerForKey:@"renderingBackend"]];
 
     NSInteger _screenSize = [[NSUserDefaults standardUserDefaults] integerForKey:@"streamResolution"];
     switch (_screenSize) {