textinput: when Width is larger than the capacity of the placeholder, it causes a panic

[MikaelFangel]

Describe the bug
When you increase the width above 31 and the placeholder capacity is set to 32, the program panics. This bug is causing the bug reported here charmbracelet/gum#591 as far as I can tell.

To Reproduce
Steps to reproduce the behavior:

1. Run the code with a ti.Width of 31
2. Run the code and see it works just fine
3. Change the value to 32
4. Run the code a see the out-of-bounds panic

Source Code

package main

import (
	"fmt"
	"log"

	"github.com/charmbracelet/bubbles/textinput"
	tea "github.com/charmbracelet/bubbletea"
)

func main() {
	p := tea.NewProgram(initialModel())
	if _, err := p.Run(); err != nil {
		log.Fatal(err)
	}
}

type model struct {
	textInput textinput.Model
	err       error
}

func initialModel() model {
	ti := textinput.New()
	ti.Placeholder = "作業ディレクトリを指定してください"
	ti.Width = 32

	return model{
		textInput: ti,
		err:       nil,
	}
}

func (m model) Init() tea.Cmd {
	return textinput.Blink
}

func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	return m, nil
}

func (m model) View() string {
	return fmt.Sprintf(
		m.textInput.View(),
	) + "\n"
}

Expected behavior
The placeholder capacity should not cause out-of-bounds panics based on the ti.Width.

Screenshots
p getting a default capacity of 32

The minWidth exceeds the capacity

The out-of-bounds slide happening