scaffold: the theme-toggle island costs 60.9kb (ThemeToggle + UiProvider), so the dashboard budget had to be 64kb

[ivndev001]

Measured in #485: solid-js 12.6kb of it; IconButton alone is 42kb. @ultimat3/ui island weight deserves a look (barrel retention, UiProvider cost) so a one-button island is not 60kb.

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