feat: add TextMate bundle provider for Slint syntax highlighting

This provider loads the Slint TextMate grammar file and registers it with
IntelliJ's TextMate system. Also adds the required textmate plugin dependency
to build.gradle.kts.

Co-Authored-By: Claude (auto) <noreply@anthropic.com>

build.gradle.kts

@@ -44,7 +44,7 @@ dependencies {
         testFramework(TestFrameworkType.Platform)
 
         // Add plugin dependencies for compilation here:
-
+        bundledPlugin("org.jetbrains.plugins.textmate")
 
     }
 }

src/main/kotlin/me/zhouxi/slint/lang/syntax/SlintTextMateProvider.kt

@@ -0,0 +1,18 @@
+package me.zhouxi.slint.lang.syntax
+
+import org.jetbrains.plugins.textmate.api.TextMateBundleProvider
+import java.nio.file.Path
+
+class SlintTextMateProvider : TextMateBundleProvider {
+    override fun getBundles(): List<TextMateBundleProvider.PluginBundle> {
+        val resource = SlintTextMateProvider::class.java.classLoader.getResource("textmate/slint.tmLanguage.json")
+            ?: throw IllegalStateException("Could not find Slint TextMate grammar file")
+
+        return listOf(
+            TextMateBundleProvider.PluginBundle(
+                "Slint",
+                Path.of(resource.toURI())
+            )
+        )
+    }
+}