feat: GHViewWeb uses "open" under macOS (reroll)

Author: Frederick888

lua/litee/gh/pr/init.lua

@@ -22,7 +22,11 @@ local M = {}
 M.autocmds = {}
 
 local function open_nodes_url(node)
-    vim.fn.system({'xdg-open', node.url})
+    if vim.fn.has('mac') == 1 then
+        vim.fn.system({ 'open', node.url })
+    else
+        vim.fn.system({ 'xdg-open', node.url })
+    end
 end
 
 local function ui_req_ctx()