workspace: Move panes to span the entire border in Vim mode (#39123)

Currently, <kbd>⌃w</kbd> + <kbd>HJKL</kbd> keystrokes swap active pane
with another pane in that direction. Also, if there is no pane to swap
with, nothing happens.

This does not match the expected Vim behavior: moving the split to span
the entire border.

See
https://github.com/vim/vim/blob/ca6a260ef1a4b4ae94bc71c17cbabf8f12bf0f8c/runtime/doc/windows.txt#L527-L549

This change adds `MovePane{Up,Down,Left,Right}` actions that do exactly
that and updates default Vim keymap.

<table>
<tr>
  <th>Before</th>
  <th>After</th>
<tr>
<td><video
src="https://github.com/user-attachments/assets/5d3a25bf-e8b6-46c1-9fbb-004f0194e0dd">
<td><video
src="https://github.com/user-attachments/assets/5276f115-5063-411e-b141-5d268a79581b">
<tr>
  <th>Vim</th>
<tr>
<td><video
src="https://github.com/user-attachments/assets/df9fbf83-d0de-42c0-8fb0-b134be833bde">
</table>

Release Notes:

- Changed `ctrl+w` + `shift-[hjkl]` in Vim mode to move the split to
span the entire border, aligning with Vim‘s behavior.

Signed-off-by: Ivan Trubach <mr.trubach@icloud.com>

assets/keymaps/vim.json

@@ -831,10 +831,10 @@
       "ctrl-w shift-right": "workspace::SwapPaneRight",
       "ctrl-w shift-up": "workspace::SwapPaneUp",
       "ctrl-w shift-down": "workspace::SwapPaneDown",
-      "ctrl-w shift-h": "workspace::SwapPaneLeft",
-      "ctrl-w shift-l": "workspace::SwapPaneRight",
-      "ctrl-w shift-k": "workspace::SwapPaneUp",
-      "ctrl-w shift-j": "workspace::SwapPaneDown",
+      "ctrl-w shift-h": "workspace::MovePaneLeft",
+      "ctrl-w shift-l": "workspace::MovePaneRight",
+      "ctrl-w shift-k": "workspace::MovePaneUp",
+      "ctrl-w shift-j": "workspace::MovePaneDown",
       "ctrl-w >": "vim::ResizePaneRight",
       "ctrl-w <": "vim::ResizePaneLeft",
       "ctrl-w -": "vim::ResizePaneDown",