Initial commit: Unity Needle AR Menu project with MenuScene and SampleScene web apps

Add root .gitignore for Unity Library/Temp/Logs, IDE folders, and node_modules.
Include Assets, Needle TypeScript (MenuController, asset picker, WebXR), and project configuration.

Made-with: Cursor

ProjectSettings/NavMeshAreas.asset

@@ -0,0 +1,91 @@
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+%TAG !u! tag:unity3d.com,2011:
+--- !u!126 &1
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