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

modules/_neovim/plugins/jj-nvim.nix

@@ -0,0 +1,42 @@
+{pkgs, ...}: let
+	jj-nvim =
+		pkgs.vimUtils.buildVimPlugin {
+			pname = "jj-nvim";
+			version = "unstable-2026-03-10";
+			src =
+				pkgs.fetchFromGitHub {
+					owner = "NicolasGB";
+					repo = "jj.nvim";
+					rev = "bbba4051c862473637e98277f284d12b050588ca";
+					hash = "sha256-nokftWcAmmHX6UcH6O79xkLwbUpq1W8N9lf1e+NyGqE=";
+				};
+			doCheck = false;
+		};
+in {
+	programs.nixvim = {
+		extraPlugins = [
+			jj-nvim
+		];
+		extraConfigLua = ''
+			require('jj').setup({
+				diff = {
+					backend = "diffview",
+				},
+				cmd = {
+					describe = {
+						editor = { type = "buffer" },
+					},
+					log = {
+						close_on_edit = false,
+					},
+				},
+				-- Disable default keymaps — we set our own in mappings.nix
+				ui = {
+					log = {
+						keymaps = true,
+					},
+				},
+			})
+		'';
+	};
+}