feat(ui): redesign modified files section in session turn (#20348)

Co-authored-by: David Hill <iamdavidhill@gmail.com>

packages/ui/src/i18n/en.ts

@@ -38,6 +38,10 @@ export const dict: Record<string, string> = {
   "ui.sessionTurn.steps.hide": "Hide steps",
   "ui.sessionTurn.summary.response": "Response",
   "ui.sessionTurn.diff.showMore": "Show more changes ({{count}})",
+  "ui.sessionTurn.diffs.changed": "Changed",
+  "ui.sessionTurn.diffs.showAll": "Show all",
+  "ui.sessionTurn.diffs.showLess": "Show less",
+  "ui.sessionTurn.diffs.more": "+{{count}} more files",
 
   "ui.sessionTurn.retry.retrying": "retrying",
   "ui.sessionTurn.retry.inSeconds": "in {{seconds}}s",