feat: page history diff (#1891)

* Show actual history changes
* V2 - WIP
* feat: page history diff
* fix: exclude content from history listing

---------

Co-authored-by: Jason Norwood-Young <jason@10layer.com>

apps/client/src/features/page-history/components/history-view.tsx

@@ -1,29 +1,44 @@
 import { usePageHistoryQuery } from "@/features/page-history/queries/page-history-query";
 import { HistoryEditor } from "@/features/page-history/components/history-editor";
 import { useTranslation } from "react-i18next";
+import { useAtomValue } from "jotai";
+import {
+  activeHistoryIdAtom,
+  activeHistoryPrevIdAtom,
+} from "@/features/page-history/atoms/history-atoms";
 
-interface HistoryProps {
-  historyId: string;
-}
-
-function HistoryView({ historyId }: HistoryProps) {
+function HistoryView() {
   const { t } = useTranslation();
-  const { data, isLoading, isError } = usePageHistoryQuery(historyId);
+  const historyId = useAtomValue(activeHistoryIdAtom);
+  const prevHistoryId = useAtomValue(activeHistoryPrevIdAtom);
 
-  if (isLoading) {
+  const {
+    data,
+    isLoading: isLoadingCurrent,
+    isError: isErrorCurrent,
+  } = usePageHistoryQuery(historyId);
+  const {
+    data: prevData,
+    isLoading: isLoadingPrev,
+    isError: isErrorPrev,
+  } = usePageHistoryQuery(prevHistoryId);
+
+  if (isLoadingCurrent || isLoadingPrev) {
     return <></>;
   }
 
-  if (isError || !data) {
+  if (isErrorCurrent || !data) {
     return <div>{t("Error fetching page data.")}</div>;
   }
 
   return (
-    data && (
-      <div>
-        <HistoryEditor content={data.content} title={data.title} />
-      </div>
-    )
+    <div>
+      <HistoryEditor
+        content={data.content}
+        title={data.title}
+        previousContent={!isErrorPrev ? prevData?.content : undefined}
+      />
+    </div>
   );
 }