Replace allotment with react-resizable-panels and simplify layout (#2029)

* merge

* switch out panel lib

* fmt

* remove allotment dep

* bump lock

* The position of the react resizable panel is lost when the page is reloaded in (vibe-kanban 6ac32e23)

`WorkspacesLayout.tsx` , but should be stored in `useUiPreferencesStore.ts`

`vibe-kanban/frontend/src/components/ui-new/containers/WorkspacesLayout.tsx`

`vibe-kanban/frontend/src/stores/useUiPreferencesStore.ts`

* remove redundant type

* add dep

---------

Co-authored-by: Louis Knight-Webb <louis@bloop.ai>

frontend/package.json

@@ -50,7 +50,6 @@
     "@tanstack/react-query": "^5.85.5",
     "@uiw/react-codemirror": "^4.25.1",
     "@virtuoso.dev/message-list": "^1.13.3",
-    "allotment": "^1.20.5",
     "class-variance-authority": "^0.7.0",
     "click-to-react-component": "^1.1.2",
     "clsx": "^2.0.0",