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 https://github.com/charmbracelet/gum/issues/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