Tidy project settings: keep App UI define, untrack machine-local prefs

ProjectSettings.asset: add APP_UI_EDITOR_ONLY scripting define (from
com.unity.dt.app-ui 1.3.6) so it stays shared across machines.
Untrack + gitignore machine-local editor state that only churns per
machine/editor: ProjectSettings/VirtualProjectsConfig.json (MPPM) and
ProjectSettings/Packages/com.unity.probuilder/Settings.json (ProBuilder
UI prefs). Files stay on disk, regenerated locally.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -127,3 +127,7 @@ InitTestScene*.unity*
 # Scratch / working areas — local screenshots + personal session notes (keep on disk, out of git)
 /_visual_scratch/
 /Docs/Vault/07_Sessions/User Sessions/
+
+# Machine-local editor state (regenerated per machine; untracked 2026-06-28)
+/ProjectSettings/VirtualProjectsConfig.json
+/ProjectSettings/Packages/com.unity.probuilder/Settings.json

ProjectSettings/Packages/com.unity.probuilder/Settings.json

@@ -1,36 +0,0 @@
-{
-    "m_Dictionary": {
-        "m_DictionaryValues": [
-            {
-                "type": "System.Boolean, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
-                "key": "lightmapping.autoUnwrapLightmapUV",
-                "value": "{\"m_Value\":true}"
-            },
-            {
-                "type": "UnityEngine.ProBuilder.LogLevel, Unity.ProBuilder, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
-                "key": "log.level",
-                "value": "{\"m_Value\":3}"
-            },
-            {
-                "type": "UnityEngine.ProBuilder.LogOutput, Unity.ProBuilder, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
-                "key": "log.output",
-                "value": "{\"m_Value\":1}"
-            },
-            {
-                "type": "System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
-                "key": "log.path",
-                "value": "{\"m_Value\":\"ProBuilderLog.txt\"}"
-            },
-            {
-                "type": "UnityEngine.ProBuilder.SemVer, Unity.ProBuilder, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
-                "key": "about.identifier",
-                "value": "{\"m_Value\":{\"m_Major\":6,\"m_Minor\":0,\"m_Patch\":9,\"m_Build\":-1,\"m_Type\":\"\",\"m_Metadata\":\"\",\"m_Date\":\"\"}}"
-            },
-            {
-                "type": "UnityEngine.ProBuilder.SemVer, Unity.ProBuilder, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
-                "key": "preferences.version",
-                "value": "{\"m_Value\":{\"m_Major\":6,\"m_Minor\":0,\"m_Patch\":9,\"m_Build\":-1,\"m_Type\":\"\",\"m_Metadata\":\"\",\"m_Date\":\"\"}}"
-            }
-        ]
-    }
-}

ProjectSettings/ProjectSettings.asset

@@ -834,7 +834,7 @@ PlayerSettings:
   webWasm2023: 0
   webEnableSubmoduleStrippingCompatibility: 0
   scriptingDefineSymbols:
-    Standalone: UNITY_BURST_EXPERIMENTAL_ATOMIC_INTRINSICS;SENTIS_ANALYTICS_ENABLED
+    Standalone: UNITY_BURST_EXPERIMENTAL_ATOMIC_INTRINSICS;SENTIS_ANALYTICS_ENABLED;APP_UI_EDITOR_ONLY
   additionalCompilerArguments: {}
   platformArchitecture: {}
   scriptingBackend:

ProjectSettings/VirtualProjectsConfig.json

@@ -1,4 +0,0 @@
-{
-  "PlayerTags": [],
-  "version": "6000.5.0f1"
-}