feat: add BatchDiffApproval component for multi-file diff application

- Introduced a new component `BatchDiffApproval` to handle the approval of batch changes across multiple files.
- Integrated the `BatchDiffApproval` component into `ChatRow` to display batch diff requests.
- Updated experimental settings to include a toggle for multi-file apply diff functionality.
- Enhanced localization files to support new strings related to batch changes in multiple languages.
- Updated tests to cover the new multi-file apply diff feature.

Author: samhvw8

packages/types/src/experiment.ts

@@ -6,12 +6,7 @@ import type { Keys, Equals, AssertEqual } from "./type-fu.js"
  * ExperimentId
  */
 
-export const experimentIds = [
-	"powerSteering",
-	"marketplace",
-	"concurrentFileReads",
-	"disableCompletionCommand",
-] as const
+export const experimentIds = ["powerSteering", "concurrentFileReads", "disableCompletionCommand", "marketplace", "multiFileApplyDiff"] as const
 
 export const experimentIdsSchema = z.enum(experimentIds)
 
@@ -26,6 +21,7 @@ export const experimentsSchema = z.object({
 	marketplace: z.boolean(),
 	concurrentFileReads: z.boolean(),
 	disableCompletionCommand: z.boolean(),
+	multiFileApplyDiff: z.boolean(),
 })
 
 export type Experiments = z.infer<typeof experimentsSchema>