Add main menu scene with Rive UI, procedural background, and scene transitions

- Add Menu scene with Rive-driven login and navigation UI
  (RiveLoginController, RiveNavigationController) for entering a
  username and starting/navigating the client via Rive triggers
- Add SceneTransitionController to fade out and load the Landscape
  gameplay scene when Play is selected
- Add procedural low-poly triangle field background and animated wave
  panel (LowPolyTriangleField, TriangleWavePanel) with matching
  editor menus and materials
- Add MenuLightAnimator for animated menu lighting and UI fade helpers
  (MenuFadeIn, DebugFadeToggle/Bridge)
- Rename SampleScene to Landscape and wire ChatNetworkManager to hide
  the new Rive login canvas once gameplay starts
- Bump Input System action codegen version and add Rive package
  references/project settings updates to support the new UI

ProjectSettings/QualitySettings.asset

@@ -6,7 +6,7 @@ QualitySettings:
   serializedVersion: 5
   m_CurrentQuality: 1
   m_QualitySettings:
-  - serializedVersion: 4
+  - serializedVersion: 5
     name: Mobile
     pixelLightCount: 2
     shadows: 2
@@ -34,6 +34,7 @@ QualitySettings:
     adaptiveVsyncExtraA: 0
     adaptiveVsyncExtraB: 0
     lodBias: 1
+    meshLodThreshold: 1
     maximumLODLevel: 0
     enableLODCrossFade: 1
     streamingMipmapsActive: 0
@@ -47,8 +48,7 @@ QualitySettings:
     asyncUploadBufferSize: 16
     asyncUploadPersistentBuffer: 1
     resolutionScalingFixedDPIFactor: 1
-    customRenderPipeline: {fileID: 11400000, guid: 5e6cbd92db86f4b18aec3ed561671858,
-      type: 2}
+    customRenderPipeline: {fileID: 11400000, guid: 5e6cbd92db86f4b18aec3ed561671858, type: 2}
     terrainQualityOverrides: 0
     terrainPixelError: 1
     terrainDetailDensityScale: 1
@@ -60,7 +60,7 @@ QualitySettings:
     terrainMaxTrees: 50
     excludedTargetPlatforms:
     - Standalone
-  - serializedVersion: 4
+  - serializedVersion: 5
     name: PC
     pixelLightCount: 2
     shadows: 2
@@ -76,7 +76,7 @@ QualitySettings:
     globalTextureMipmapLimit: 0
     textureMipmapLimitSettings: []
     anisotropicTextures: 2
-    antiAliasing: 0
+    antiAliasing: 8
     softParticles: 0
     softVegetation: 1
     realtimeReflectionProbes: 0
@@ -88,6 +88,7 @@ QualitySettings:
     adaptiveVsyncExtraA: 0
     adaptiveVsyncExtraB: 0
     lodBias: 2
+    meshLodThreshold: 1
     maximumLODLevel: 0
     enableLODCrossFade: 1
     streamingMipmapsActive: 0
@@ -101,8 +102,7 @@ QualitySettings:
     asyncUploadBufferSize: 16
     asyncUploadPersistentBuffer: 1
     resolutionScalingFixedDPIFactor: 1
-    customRenderPipeline: {fileID: 11400000, guid: 4b83569d67af61e458304325a23e5dfd,
-      type: 2}
+    customRenderPipeline: {fileID: 11400000, guid: 4b83569d67af61e458304325a23e5dfd, type: 2}
     terrainQualityOverrides: 0
     terrainPixelError: 1
     terrainDetailDensityScale: 1
@@ -122,6 +122,7 @@ QualitySettings:
     GameCoreXboxOne: 1
     Lumin: 0
     Nintendo Switch: 1
+    Nintendo Switch 2: 1
     PS4: 1
     PS5: 1
     Server: 0