Move SealShare onto Livewire Material

Replaces maryUI and daisyUI with nonameweb/livewire-material: the Vibrant
indigo scheme, a system/light/dark theme under sealshare-theme, one top
app bar with the account menu, the upload drop zone and link-ready
moments, M3 fields, dialogs instead of wire:confirm, snackbars instead of
flashed messages, a sortable admin table, and the starter-kit cleanup.
Docker builds assets after Composer; CI drops the Flux step.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

app/Providers/FortifyServiceProvider.php

@@ -49,7 +49,6 @@ class FortifyServiceProvider extends ServiceProvider
         Fortify::verifyEmailView(fn () => view('pages::auth.verify-email'));
         Fortify::twoFactorChallengeView(fn () => view('pages::auth.two-factor-challenge'));
         Fortify::confirmPasswordView(fn () => view('pages::auth.confirm-password'));
-        Fortify::registerView(fn () => view('pages::auth.register'));
         Fortify::resetPasswordView(fn () => view('pages::auth.reset-password'));
         Fortify::requestPasswordResetLinkView(fn () => view('pages::auth.forgot-password'));
     }