Remove screenshot backgrounds and refresh themed demo flow

Neon Vision Editor.xcodeproj/project.pbxproj

@@ -361,7 +361,7 @@
 				CODE_SIGNING_ALLOWED = YES;
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 440;
+				CURRENT_PROJECT_VERSION = 441;
 				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = CS727NF72U;
 				ENABLE_APP_SANDBOX = YES;
@@ -444,7 +444,7 @@
 				CODE_SIGNING_ALLOWED = YES;
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 440;
+				CURRENT_PROJECT_VERSION = 441;
 				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = CS727NF72U;
 				ENABLE_APP_SANDBOX = YES;

README.md

@@ -284,8 +284,8 @@ Availability legend: `Full` = complete support, `Partial` = available with platf
 
 <p align="center">
   <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="docs/images/neon-demo-dark.gif">
     <source media="(prefers-color-scheme: light)" srcset="docs/images/neon-demo-light.gif">
-    <source media="(prefers-color-scheme: dark)" srcset="docs/images/neon-demo.gif">
     <img src="docs/images/neon-demo-light.gif" alt="Neon Vision Editor Demo">
   </picture>
 </p>

docs/images/README.md

@@ -26,11 +26,15 @@ This index describes screenshot assets in `docs/images` and where they are used.
 
 - `neon-demo.gif`
   - Description: Short animated loop generated from the three screenshots.
-  - Used in: Root `README.md` (`1-Minute Demo Flow`, dark mode source).
+  - Used in: Legacy/demo compatibility fallback.
 
 - `neon-demo-light.gif`
-  - Description: Light-mode variant of the demo loop with a neutral light canvas background.
-  - Used in: Root `README.md` (`1-Minute Demo Flow`, light mode source).
+  - Description: Light-mode demo loop with pure white background.
+  - Used in: Root `README.md` (`1-Minute Demo Flow`, light-mode source).
+
+- `neon-demo-dark.gif`
+  - Description: Dark-mode demo loop with pure black background.
+  - Used in: Root `README.md` (`1-Minute Demo Flow`, dark-mode source).
 
 - `neon-demo.mp4`
   - Description: Default demo-flow video (H.264 MP4) for improved quality and smaller payload than GIF.