refactor: add toInlinedName utility and replace inline schema name sanitization logic

- Introduced `toInlinedName` to simplify dot separator replacement with underscores.
- Replaced redundant sanitization logic in `TypeMapping` and `ModelGenerator` with the new utility.

Author: halotukozak

core/src/main/kotlin/com/avsystem/justworks/core/gen/ModelGenerator.kt

@@ -1,7 +1,6 @@
 package com.avsystem.justworks.core.gen
 
 import arrow.core.raise.catch
-import arrow.core.tail
 import com.avsystem.justworks.core.model.ApiSpec
 import com.avsystem.justworks.core.model.EnumModel
 import com.avsystem.justworks.core.model.PrimitiveType
@@ -457,11 +456,9 @@ class ModelGenerator(private val modelPackage: String) {
         return visited.toList()
     }
 
-    context(hierarchy: HierarchyInfo)
-    private fun generateNestedInlineClass(schema: SchemaModel): FileSpec {
-        val sanitizedName = schema.name.replace(".", "")
-        return generateDataClass(schema.copy(name = sanitizedName))
-    }
+    context(_: HierarchyInfo)
+    private fun generateNestedInlineClass(schema: SchemaModel): FileSpec =
+        generateDataClass(schema.copy(name = schema.name.toInlinedName()))
 
     private val SchemaModel.isPrimitiveOnly: Boolean
         get() = properties.isEmpty() && allOf == null && oneOf == null && anyOf == null

core/src/main/kotlin/com/avsystem/justworks/core/gen/NameUtils.kt

@@ -38,6 +38,12 @@ fun String.toEnumConstantName(): String {
     }
 }
 
+/**
+ * Sanitizes a nested inline schema name by removing dot separators.
+ * E.g. "Pet.Address" becomes "Pet_Address".
+ */
+fun String.toInlinedName(): String = replace(".", "_")
+
 /**
  * Generates a PascalCase operation name from HTTP method and path.
  * Path parameters like {id} become "ById", {userId} becomes "ByUserId".

core/src/main/kotlin/com/avsystem/justworks/core/gen/TypeMapping.kt

@@ -48,9 +48,7 @@ object TypeMapping {
         }
 
         is TypeRef.Inline -> {
-            // For nested inline classes (e.g., "Pet.Address"), sanitize to "PetAddress"
-            val sanitizedName = typeRef.contextHint.replace(".", "")
-            ClassName(modelPackage, sanitizedName)
+            ClassName(modelPackage, typeRef.contextHint.toInlinedName())
         }
 
         is TypeRef.Unknown -> {