Typemap / exclusive-lock (+l) manager for Unreal binaries

- Tools -> Exclusive Locks (typemap): view/edit server typemap, one-click add
  recommended binary+l rules for UE asset types (.uasset/.umap/.fbx/textures/etc)
- Per-file 'Set exclusive-lock type (+l)' in the Changes context menu
- Backend p4 typemap -o/-i and reopen -t

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/p4.ts

@@ -118,6 +118,9 @@ export const p4 = {
   openedAll: (scope = "") => invoke<OpenedFile[]>("p4_opened_all", { scope }),
   lock: (files: string[]) => invoke<string>("p4_lock", { files }),
   unlock: (files: string[]) => invoke<string>("p4_unlock", { files }),
+  typemapGet: () => invoke<string[]>("p4_typemap_get"),
+  typemapSet: (entries: string[]) => invoke<string>("p4_typemap_set", { entries }),
+  reopenType: (files: string[], filetype: string) => invoke<string>("p4_reopen_type", { files, filetype }),
   shelve: (change: string) => invoke<string>("p4_shelve", { change }),
   unshelve: (change: string) => invoke<string>("p4_unshelve", { change }),
   deleteShelf: (change: string) => invoke<string>("p4_delete_shelf", { change }),