### What Changes
1. Used `@preact/signal` and `@lit/context` to simplify repetitive passing of properties of TOC components,
2. Fixed TOC invalid when editor changed, such as click new page button.
fix AF-2068, AF-2069, AF-1175, AF-2061, AF-2079, AF-2034, AF-2080, AF-1960, AF-2081
1. replace `dnd-kit` with `@atlaskit/pragmatic-drag-and-drop`
2. allow creating split views by drag & drop the following
a. WorkbenchLinks (route links), like journals, trash, all docs
b. doc refs
c. tags/collection
3. style adjustments to split view
4. remove split view's feature flag and make it GA for electron
https://github.com/user-attachments/assets/6a3e4a25-faa2-4215-8eb0-983f44db6e8c