Plugin downloads use core Alpine version, causing 404s / mismatches

[elabx]

cc @markusthomas

In AlpineJS::downloadAlpineFiles($version), plugin downloads reuse the core Alpine version:

foreach (self::$pluginsList as $name => $filename) {
    $url = "https://unpkg.com/@alpinejs/{$name}@{$version}/dist/{$filename}";
    ...
}

Alpine plugins are versioned independently on npm — @alpinejs/mask, @alpinejs/persist, etc. each have their own release cadence. Reusing the core version will often:

• 404 when no plugin release exists at that version
• Pull a mismatched version when one happens to exist but isn't actually paired with that core release

Failures are silently logged as warnings via $this->warning(), so users won't necessarily notice their plugins didn't download.

Proposed fix

Resolve each plugin's latest version individually via the npm registry, similar to how getRemoteVersion() already works for core:

https://registry.npmjs.org/@alpinejs/{name}/latest

Then download from unpkg.com/@alpinejs/{name}@{resolved_version}/dist/cdn.min.js.