feat: add open alpha banner

apps/web/src/styles/alpha-banner.css

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+.alpha-banner{width:min(1480px,calc(100% - 48px));min-height:39px;margin:0 auto 8px;padding:7px 9px 7px 13px;display:flex;align-items:center;justify-content:space-between;gap:18px;border:1px solid #c7d3ca;border-radius:11px;background:linear-gradient(90deg,#e8efdf,#f7f9f3);color:#405552;font-size:11px}.alpha-banner>div,.alpha-banner strong,.alpha-banner nav{display:flex;align-items:center;gap:10px}.alpha-banner strong{text-transform:uppercase;letter-spacing:.08em;color:var(--deep);white-space:nowrap}.alpha-banner strong i{width:7px;height:7px;border-radius:50%;background:#789f35;box-shadow:0 0 0 4px #789f3518}.alpha-banner nav a{text-underline-offset:3px;white-space:nowrap}.alpha-banner__cta{padding:6px 10px;border-radius:7px;background:var(--deep);color:#fff;text-decoration:none}@media(max-width:720px){.alpha-banner{width:calc(100% - 28px);margin-top:9px}.alpha-banner>div>span,.alpha-banner nav a:not(.alpha-banner__cta){display:none}}