Add OAuth modules for 2025.3 (253) platform

JetBrains split OAuth classes into separate modules in 2025.3:
- intellij.platform.collaborationTools.auth.base
- intellij.platform.collaborationTools.auth

These must be explicitly bundled for 253+ builds to resolve
OAuthServiceBase, OAuthCallbackHandlerBase, PkceUtils, etc.

Fixes all 56 OAuth-related compilation errors.

Author: aseemxs

buildSrc/src/main/kotlin/toolkit-intellij-subplugin.gradle.kts

@@ -101,6 +101,14 @@ dependencies {
         bundledPlugins(toolkitIntelliJ.productProfile().map { it.bundledPlugins })
         plugins(toolkitIntelliJ.productProfile().map { it.marketplacePlugins })
 
+        // OAuth modules split in 2025.3 (253) - must be explicitly bundled
+        val versionStr = version.get()
+        if (versionStr.contains("253")) {
+            bundledModule("intellij.platform.collaborationTools")
+            bundledModule("intellij.platform.collaborationTools.auth.base")
+            bundledModule("intellij.platform.collaborationTools.auth")
+        }
+
         testFramework(TestFrameworkType.Plugin.Java)
         testFramework(TestFrameworkType.Platform)
         testFramework(TestFrameworkType.JUnit5)