fix: apply specific value style

[stoned]

..., if any, for all lines of a multiple lines value

• I have read CONTRIBUTING.md.
• [ ] I have created a discussion that was approved by a maintainer (for new features). (N/A)

Please, compare the provided example without and with the proposed fix.

package main

import (
	"os"
	"charm.land/lipgloss/v2"
	"charm.land/log/v2"
)

func main() {
	styles := log.DefaultStyles()
	styles.Values["foo"] = lipgloss.NewStyle().Foreground(lipgloss.Yellow)
	logger := log.New(os.Stdout)
	logger.SetStyles(styles)
	logger.Info("dummy", "foo", "line1\nline2")
}