fix(amazonq): Normalize generated file paths in feature dev. (aws#5130)

The agent may generate files with or without a leading slash in the generated file path. In JetBrains, this results in an exception thrown when attempting to write to the root directory on MacOS. (Various other failure modes may occur due to lack of normalization, depending on OS.)

This change normalized handling within /dev, to avoid breakage or other side effects of non-normalized file paths.

Author: ctidd

.changes/next-release/bugfix-fd7f4f61-241e-40a6-b92a-3e4fe7e832db.json

@@ -0,0 +1,4 @@
+{
+  "type" : "bugfix",
+  "description" : "Amazon Q /dev: Fix error when accepting changes if leading slash is present."
+}

plugins/amazonq/chat/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonqFeatureDev/session/CodeGenerationState.kt

@@ -258,7 +258,8 @@ private suspend fun CodeGenerationState.generateCode(
 fun registerNewFiles(newFileContents: Map<String, String>): List<NewFileZipInfo> =
     newFileContents.map {
         NewFileZipInfo(
-            zipFilePath = it.key,
+            // Note: When managing file state, we normalize file paths returned from the agent in order to ensure they are handled as relative paths.
+            zipFilePath = it.key.removePrefix("/"),
             fileContent = it.value,
             rejected = false,
             changeApplied = false
@@ -268,7 +269,8 @@ fun registerNewFiles(newFileContents: Map<String, String>): List<NewFileZipInfo>
 fun registerDeletedFiles(deletedFiles: List<String>): List<DeletedFileInfo> =
     deletedFiles.map {
         DeletedFileInfo(
-            zipFilePath = it,
+            // Note: When managing file state, we normalize file paths returned from the agent in order to ensure they are handled as relative paths.
+            zipFilePath = it.removePrefix("/"),
             rejected = false,
             changeApplied = false
         )