Convert frontend code to typescript (#31559)

None of the frontend js/ts files was touched besides these two commands
(edit: no longer true, I touched one file in
https://github.com/go-gitea/gitea/pull/31559/commits/61105d0618e285d97e95044bfb64415f364a4526
because of a deprecation that was not showing before the rename).

`tsc` currently reports 778 errors, so I have disabled it in CI as
planned.

Everything appears to work fine.

1 files changed, 17 insertions, 0 deletions

diff --git a/web_src/js/features/repo-diff-filetree.ts b/web_src/js/features/repo-diff-filetree.ts
new file mode 100644
index 0000000000..6d9533d066
--- /dev/null
+++ b/web_src/js/features/repo-diff-filetree.ts
@@ -0,0 +1,17 @@
+import {createApp} from 'vue';
+import DiffFileTree from '../components/DiffFileTree.vue';
+import DiffFileList from '../components/DiffFileList.vue';
+
+export function initDiffFileTree() {
+  const el = document.querySelector('#diff-file-tree');
+  if (!el) return;
+
+  const fileTreeView = createApp(DiffFileTree);
+  fileTreeView.mount(el);
+
+  const fileListElement = document.querySelector('#diff-file-list');
+  if (!fileListElement) return;
+
+  const fileListView = createApp(DiffFileList);
+  fileListView.mount(fileListElement);
+}