feat: support cursor keys for calendar navigation (nvim-orgmode#767)

Co-authored-by: Sebastian Flügge <[email protected]>

Author: seflue

lua/orgmode/objects/calendar.lua

@@ -106,6 +106,18 @@ function Calendar:open()
   vim.keymap.set('n', 'l', function()
     return self:cursor_right()
   end, map_opts)
+  vim.keymap.set('n', '<Down>', function()
+    return self:cursor_down()
+  end, map_opts)
+  vim.keymap.set('n', '<Up>', function()
+    return self:cursor_up()
+  end, map_opts)
+  vim.keymap.set('n', '<Left>', function()
+    return self:cursor_left()
+  end, map_opts)
+  vim.keymap.set('n', '<Right>', function()
+    return self:cursor_right()
+  end, map_opts)
   vim.keymap.set('n', '>', function()
     return self:forward()
   end, map_opts)