nvim: Switch zenmode to new toggle map

Like other 'switch' toggles, turn on/off zen-mode with `]sz`/`[sz`
respectively.

nvim/.config/nvim/lua/plugins/prose.lua

@@ -34,7 +34,24 @@ local prose_plugs = {
 		config = true,
 		cmd = { "ZenMode" },
 		dependencies = { "folke/twilight.nvim" },
-		keys = { { "<leader>sz", ":ZenMode<cr>", silent = true, desc = "toggle zen mode" } },
+		keys = {
+			{
+				"[sz",
+				function()
+					require("zen-mode").close()
+				end,
+				silent = true,
+				desc = "stop zen mode",
+			},
+			{
+				"]sz",
+				function()
+					require("zen-mode").open()
+				end,
+				silent = true,
+				desc = "start zen mode",
+			},
+		},
 	},
 	{
 		"andrewferrier/wrapping.nvim",