fix: make sure to get the final highlight values rather than link names (#1682)

* fix: make sure to get the final highlight values rather than link names

* fix: update other `nvim_get_hl` calls to use `link = false`

* fix: more link = false

---------

Co-authored-by: yetone <yetoneful@gmail.com>

lua/avante/utils/init.lua

@@ -311,7 +311,7 @@ end
 ---@return table<string, string>
 function M.get_hl(name)
   if not name then return {} end
-  return api.nvim_get_hl(0, { name = name })
+  return api.nvim_get_hl(0, { name = name, link = false })
 end
 
 --- vendor from lazy.nvim for early access and override