feat: link diff and confirm (#1635)

lua/avante/utils/init.lua

@@ -1169,4 +1169,14 @@ function M.parse_iso8601_date(iso_str)
   return tostring(os.date("%Y-%m-%d %H:%M:%S", timestamp)), nil
 end
 
+function M.random_string(length)
+  local charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+  local result = {}
+  for _ = 1, length do
+    local rand = math.random(1, #charset)
+    table.insert(result, charset:sub(rand, rand))
+  end
+  return table.concat(result)
+end
+
 return M