✅ ModelにisGuest()を追記

/app/Models/User.php

<?php

namespace App\Models;

class User extends Authenticatable
{

    ~~~

    // ゲストログイン
    public function isGuest()
    {
    return $this->email === 'guest@example.com';
    }
}

✅ viewsを編集

タイトルに編集不可であることを追記

/views/profile/edit.blade.php

{{ __('Profile') }} @if(Auth::user()->isGuest()) (GuestLoginの場合、編集不可) @endif

✅ 「update-profile-information-form.blade.php」の「name」と「email」を編集不可にする

inputの編集

以下2つを update-profile-information-form.blade.php に追記する

{{ Auth::user()->isGuest() ? 'cursor-not-allowed' : '' }}

:disabled="Auth::user()->isGuest()"

↓

// /views/profile/partials/update-profile-information-form.blade.php

# name
<x-text-input id="name" name="name" type="text" class="mt-1 block w-full 
    {{ Auth::user()->isGuest() ? 'cursor-not-allowed' : '' }}" 
    :value="old('name', $user->name)" required autofocus autocomplete="name" 
    :disabled="Auth::user()->isGuest()" />

# email
<x-text-input id="email" name="email" type="email" class="mt-1 block w-full 
    {{ Auth::user()->isGuest() ? 'cursor-not-allowed' : '' }}" 
    :value="old('email', $user->email)" required autocomplete="username" 
    :disabled="Auth::user()->isGuest()" />

buttonの編集

// /views/profile/partials/update-profile-information-form.blade.php

# 編集前
{{-- <div class="flex items-center gap-4">
    <x-primary-button>{{ __('Save') }}</x-primary-button>

    @if (session('status') === 'profile-updated')
        <p
            x-data="{ show: true }"
            x-show="show"
            x-transition
            x-init="setTimeout(() => show = false, 2000)"
            class="text-sm text-gray-600"
        >{{ __('Saved.') }}</p>
    @endif
</div> --}}

# 編集後
<div class="flex items-center gap-4">
    @if(Auth::user()->isGuest())
        <x-primary-button disabled class="opacity-50 cursor-not-allowed">
            {{ __('Save') }}
        </x-primary-button>
    @else
        <x-primary-button>
            {{ __('Save') }}
        </x-primary-button>
    @endif

    @if (session('status') === 'profile-updated')
        <p
            x-data="{ show: true }"
            x-show="show"
            x-transition
            x-init="setTimeout(() => show = false, 2000)"
            class="text-sm text-gray-600"
        >{{ __('Saved.') }}</p>
    @endif
</div>

「update-password-form.blade.php」の「current_password」と「password」と「password_confirmation」を編集不可にする

inputの編集

以下2つを update-password-form.blade.php に追記する

{{ Auth::user()->isGuest() ? 'cursor-not-allowed' : '' }}

:disabled="Auth::user()->isGuest()"

↓

// /views/profile/partials/update-password-form.blade.php

# current-password
<x-text-input id="current_password" name="current_password" type="password" class="mt-1 block w-full 
    {{ Auth::user()->isGuest() ? 'cursor-not-allowed' : '' }}" 
    autocomplete="current-password" 
    :disabled="Auth::user()->isGuest()" />

# password
<x-text-input id="password" name="password" type="password" class="mt-1 block w-full 
    {{ Auth::user()->isGuest() ? 'cursor-not-allowed' : '' }}" 
    autocomplete="new-password" 
    :disabled="Auth::user()->isGuest()" />

# password_confirmation
<x-text-input id="password_confirmation" name="password_confirmation" type="password" class="mt-1 block w-full 
    {{ Auth::user()->isGuest() ? 'cursor-not-allowed' : '' }}" 
    autocomplete="new-password" 
    :disabled="Auth::user()->isGuest()" />

buttonの編集

// /views/profile/partials/update-password-form.blade.php

# 編集前
{{-- <div class="flex items-center gap-4">
    <x-primary-button>{{ __('Save') }}</x-primary-button>

    @if (session('status') === 'password-updated')
        <p
            x-data="{ show: true }"
            x-show="show"
            x-transition
            x-init="setTimeout(() => show = false, 2000)"
            class="text-sm text-gray-600"
        >{{ __('Saved.') }}</p>
    @endif
</div> --}}

# 編集後
<div class="flex items-center gap-4">
    @if(Auth::user()->isGuest())
        <x-primary-button disabled class="opacity-50 cursor-not-allowed">
            {{ __('Save') }}
        </x-primary-button>
    @else
        <x-primary-button>
            {{ __('Save') }}
        </x-primary-button>
    @endif

    @if (session('status') === 'password-updated')
        <p
            x-data="{ show: true }"
            x-show="show"
            x-transition
            x-init="setTimeout(() => show = false, 2000)"
            class="text-sm text-gray-600"
        >{{ __('Saved.') }}</p>
    @endif
</div>

「delete-user-form.blade.php」の「button2箇所」を編集不可にする

1箇所目の編集

// /views/profile/partials/delete-user-form.blade.php

# 編集前
{{-- <x-danger-button
    x-data=""
    x-on:click.prevent="$dispatch('open-modal', 'confirm-user-deletion')"
>{{ __('Delete Account') }}</x-danger-button> --}}

# 編集後
@if(Auth::user()->isGuest())
    <x-danger-button disabled class="opacity-50 cursor-not-allowed">
        {{ __('Delete Account') }}
    </x-danger-button>
@else
    <x-danger-button
        x-data=""
        x-on:click.prevent="$dispatch('open-modal', 'confirm-user-deletion')"
    >
        {{ __('Delete Account') }}
    </x-danger-button>
@endif

2箇所目の編集

こちらは1箇所目を修正していれば表示されることはないが、念のために修正する

/views/profile/partials/delete-user-form.blade.php

# 編集前
{{-- <x-danger-button class="ml-3">
    {{ __('Delete Account') }}
</x-danger-button> --}}

# 編集後
@if(Auth::user()->isGuest())
    {{-- 表示はされるが無効化 --}}
    <x-danger-button class="ml-3 opacity-50 cursor-not-allowed" disabled>
        {{ __('Delete Account') }}
    </x-danger-button>
@else
    {{-- 通常ユーザー用 --}}
    <x-danger-button type="submit" class="ml-3">
        {{ __('Delete Account') }}
    </x-danger-button>
@endif

参考：GuestLoginの実装