enhance(perf): insert and delete blocks (#9142)

* enhance(perf): improve performance for both insert and delete

* fix: remember cursor pos before executing the body in a transaction

Otherwise, the edit-block and position could be changed

* fix: disable delete-concat when there's no child or right sibling

---------

Co-authored-by: Gabriel Horner <97210743+logseq-cldwalker@users.noreply.github.com>
Co-authored-by: Gabriel Horner <gabriel@logseq.com>

src/main/frontend/components/block.cljs

@@ -927,8 +927,7 @@
         [:span.warning.mr-1 {:title "Block ref invalid"}
          (block-ref/->block-ref id)]))
   [:span.warning.mr-1 {:title "Block ref invalid"}
-    (block-ref/->block-ref id)]
-))
+    (block-ref/->block-ref id)]))
 
 (defn inline-text
   ([format v]