nvim: Use snacks.nvim for zenmode and papis if available

Remove dependency on 'twilight.nvim' and make dependencies on
'snacks.nvim' optional, but load it in the base plugins.

nvim/.config/nvim/lua/modules/base.lua

@@ -381,6 +381,7 @@ return {
 			},
 		},
 	},
+	{ "folke/snacks.nvim", lazy = false, opts = {} },
 	-- try to avoid putting files in util buffers, e.g. filetree, aerial, undotree, ..
 	{ "stevearc/stickybuf.nvim", config = true },
 	-- make it a little less painful to open really big (>2mb) files by disabling features

nvim/.config/nvim/lua/modules/prose.lua

@@ -47,12 +47,18 @@ local prose_plugs = {
 		"folke/zen-mode.nvim",
 		config = true,
 		cmd = { "ZenMode" },
-		dependencies = { "folke/twilight.nvim", { "arnamak/stay-centered.nvim", opts = { enabled = false } } },
+		dependencies = {
+			{ "folke/snacks.nvim", optional = true, opts = { dim = { enabled = true } } },
+			{ "arnamak/stay-centered.nvim", opts = { enabled = false } },
+		},
 		keys = {
 			{
 				"[sz",
 				function()
 					require("zen-mode").close()
+					if require("core.util").is_available("snacks") then
+						Snacks.dim.disable()
+					end
 					require("stay-centered").disable()
 				end,
 				silent = true,
@@ -62,6 +68,9 @@ local prose_plugs = {
 				"]sz",
 				function()
 					require("zen-mode").open()
+					if require("core.util").is_available("snacks") then
+						Snacks.dim.enable()
+					end
 					require("stay-centered").enable()
 				end,
 				silent = true,