Stop asking what theme to install in installation wizard

[Copilot]

WHY

BEFORE - What was wrong? What was happening before this PR?

Running php artisan backpack:install prompted the user to choose from 3 themes (Theme-tabler, CoreUI v4, CoreUI v2). This choice is unnecessary in v7 — Theme-tabler is the standard.

AFTER - What is happening after this PR?

Theme-tabler is installed automatically, with no prompt. If a theme is already installed, installation is skipped. Users can still uninstall/swap themes afterward.

HOW

How did you achieve that, in technical terms?

• installTheme(): Replaced the interactive listChoice() prompt with a direct call to backpack:require:theme-tabler, guarded by isAnyThemeInstalled().
• handle(): Moved installTheme() outside the no-interaction guard — both interactive and non-interactive paths now share the same auto-install logic, removing the duplicated else branch.
• Removed the now-unused isEveryThemeInstalled() private method.

Is it a breaking change?

No. Developers who already have a theme installed won't be affected. Those without one will get Theme-tabler automatically instead of being prompted.

How can we test the before & after?

Before: Run php artisan backpack:install on a fresh install — you'd be prompted to pick a theme.

After: Run php artisan backpack:install — Theme-tabler installs automatically with no prompt.

# Fresh Laravel app, no theme installed
php artisan backpack:install
# Theme-tabler should install silently without any theme selection prompt

Original prompt

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This section details on the original issue you should resolve

<issue_title>Stop asking what theme to install in installation wizard</issue_title>
<issue_description>When you install backpack/crud and run php artisan backpack:install you get asked what theme you want installed. That's no longer needed in v7 - we should assume the developer wants to install Theme-tabler and do that automatically. They would still be able to un-install it if then want.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Stop asking what theme to install in installation wizard #5951

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