release: prepare 0.13.1 sidebar startup hotfix from stable (#7902)

* fix(app): keep the sidebar alive when a workspace entry has not hydrated (#7896)

ProjectBlock asserted that every placement in a project has an entry in
workspaceEntriesByKey. A retained sidebar that is inactive (compact layout
with the sidebar closed) or still waiting for sessions keeps an empty map,
and Show background stops the project list from being pruned to hydrated
entries. From the eighth workspace on, selectSidebarGroupVisibility asked
for the status of a missing entry and the app crashed on start.

Count a missing entry as Done. It renders no row, so it should not claim a
slot past the limit.

Closes #7869

Co-authored-by: brucey0x <11062155+brucey0x@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
(cherry picked from commit 6bc4b73c42)

* docs(release): add 0.13.1 hotfix notes

* chore(release): cut 0.13.1

---------

Co-authored-by: Budi <11062155+budivoogt@users.noreply.github.com>
Co-authored-by: brucey0x <11062155+brucey0x@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

plugins/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@getpaseo/builtin-plugins",
-  "version": "0.13.0",
+  "version": "0.13.1",
   "private": true,
   "type": "module",
   "scripts": {