feat: add the admin layout shell

assets/icons/lucide/calendar-days.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><g fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2"><path d="M8 2v3m8-3v3"/><rect width="18" height="18" x="3" y="3" rx="2"/><path d="M3 9h18M8 13h.01M12 13h.01M16 13h.01M8 17h.01M12 17h.01M16 17h.01"/></g></svg>

assets/icons/lucide/layout-grid.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><g fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2"><rect width="7" height="7" x="3" y="3" rx="1"/><rect width="7" height="7" x="14" y="3" rx="1"/><rect width="7" height="7" x="14" y="14" rx="1"/><rect width="7" height="7" x="3" y="14" rx="1"/></g></svg>

assets/icons/lucide/log-out.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="m16 17l5-5l-5-5m5 5H9m0 9H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"/></svg>

assets/icons/lucide/menu.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 5h16M4 12h16M4 19h16"/></svg>

assets/icons/lucide/x.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M18 6L6 18M6 6l12 12"/></svg>