Standardize file state properties to use file_state enum instead of is_new/is_deleted flags

Author: robertpiosik

packages/ui/src/components/editor/panel/ResponsePreview/ResponsePreview.stories.tsx

@@ -31,14 +31,14 @@ const files_using_fallbacks = [
   {
     type: 'file',
     file_path: 'src/new-feature.ts',
-    is_new: true,
+    file_state: 'new',
     lines_added: 50,
     lines_removed: 0
   },
   {
     type: 'file',
     file_path: 'src/old-component.tsx',
-    is_deleted: true,
+    file_state: 'deleted',
     lines_added: 0,
     lines_removed: 100
   },

packages/vscode/src/commands/apply-chat-response-command/utils/preview/vscode-ui.ts

@@ -34,7 +34,7 @@ export const show_diff_with_actions = async (
 
   const title = path.basename(prepared_file.reviewable_file.file_path)
 
-  if (!prepared_file.reviewable_file.is_deleted) {
+  if (prepared_file.reviewable_file.file_state !== 'deleted') {
     await vscode.commands.executeCommand(
       'vscode.diff',
       left_doc_uri,