Describe the bug
The init() function calls _ = lipgloss.HasDarkBackground(), which accesses the terminal and produces OSC/DSR sequences (e.g., ^[]11;rgb:0000/0000/0000^[\^[[78;1R) before main().
This output appears when the program is run via spawn in an expect script.

Setup

• OS: macOS
• Shell: bash
• Terminal Emulator: iTerm2
• Terminal Multiplexer: no

To Reproduce

1. Write an expect script that uses spawn to run a Bubble Tea program.
2. Observe that terminal sequences are printed before main() executes.

Source Code

#!/usr/bin/env expect
spawn ./program
expect "Hello"
interact

package main

import (
        "flag"
        "fmt"

        tea "github.com/charmbracelet/bubbletea"
)

func main() {
        useTea := flag.Bool("tea", false, "use Bubble Tea")
        flag.Parse()

        if *useTea {
                tea.Println("Hello, Tea.")
                return
        }

        fmt.Println("Hello, World.")
}

Expected behavior
The init() function should not produce unwanted terminal output when the program is run via spawn in an expect script.

Screenshots

$ ./expect.sh
spawn ./program
^[]11;rgb:0000/0000/0000^[\^[[78;1RHello, World.
^[]11;rgb:0000/0000/0000^[\^[[78;1R

Additional context
Consider performing terminal detection lazily, e.g., with sync.Once when it is actually needed in the program.