Add jj.nvim, diffview.nvim, and code-review.nvim with <leader>v (+VCS) and <leader>r (+Review) keybinding groups

modules/_neovim/plugins/diffview.nix

@@ -0,0 +1,26 @@
+{pkgs, ...}: {
+	programs.nixvim = {
+		extraPlugins = with pkgs.vimPlugins; [
+			diffview-nvim
+		];
+		extraConfigLua = ''
+			require('diffview').setup({
+				enhanced_diff_hl = true,
+				view = {
+					default = { layout = "diff2_horizontal" },
+					merge_tool = { layout = "diff3_mixed", disable_diagnostics = true },
+					file_history = { layout = "diff2_horizontal" },
+				},
+				default_args = {
+					DiffviewOpen = { "--imply-local" },
+				},
+				hooks = {
+					diff_buf_read = function(bufnr)
+						vim.opt_local.wrap = false
+						vim.opt_local.list = false
+					end,
+				},
+			})
+		'';
+	};
+}