feat: implement runtime authentication handling

- Added a new proxy function to manage runtime authentication types and set cookies accordingly.
- Introduced runtime authentication configuration to dynamically adjust UI based on the selected auth type.
- Updated global styles to hide specific authentication buttons based on the current auth type.
- Refactored sign-in button and hero section components to utilize the new runtime authentication logic.
- Created a new utility file for runtime authentication configuration and initialization script.

surfsense_web/lib/runtime-auth-config.ts

@@ -0,0 +1,52 @@
+export const RUNTIME_AUTH_TYPE_COOKIE_NAME = "surfsense_auth_type";
+
+export type RuntimeAuthUiMode = "GOOGLE" | "LOCAL";
+
+export function resolveRuntimeAuthUiMode(
+	value: string | null | undefined,
+	fallback: string | null | undefined = "GOOGLE"
+): RuntimeAuthUiMode {
+	const candidate = value?.trim().toUpperCase();
+	if (candidate === "GOOGLE") return "GOOGLE";
+	if (candidate === "LOCAL") return "LOCAL";
+
+	const fallbackCandidate = fallback?.trim().toUpperCase();
+	return fallbackCandidate === "GOOGLE" ? "GOOGLE" : "LOCAL";
+}
+
+export function getRuntimeAuthInitScript(fallbackAuthType: string): string {
+	const fallback = resolveRuntimeAuthUiMode(fallbackAuthType);
+	const cookieName = JSON.stringify(RUNTIME_AUTH_TYPE_COOKIE_NAME);
+	const fallbackValue = JSON.stringify(fallback);
+
+	return `
+(function() {
+	try {
+		var cookieName = ${cookieName};
+		var fallback = ${fallbackValue};
+		var prefix = cookieName + "=";
+		var rawValue = fallback;
+		var cookies = document.cookie ? document.cookie.split(";") : [];
+		for (var i = 0; i < cookies.length; i++) {
+			var cookie = cookies[i].trim();
+			if (cookie.indexOf(prefix) === 0) {
+				rawValue = decodeURIComponent(cookie.slice(prefix.length));
+				break;
+			}
+		}
+		var normalized = String(rawValue || fallback).toUpperCase() === "GOOGLE" ? "GOOGLE" : "LOCAL";
+		window.__SURFSENSE_AUTH_TYPE__ = normalized;
+		document.documentElement.setAttribute("data-surfsense-auth-type", normalized);
+	} catch (_) {
+		window.__SURFSENSE_AUTH_TYPE__ = ${fallbackValue};
+		document.documentElement.setAttribute("data-surfsense-auth-type", ${fallbackValue});
+	}
+})();
+`;
+}
+
+declare global {
+	interface Window {
+		__SURFSENSE_AUTH_TYPE__?: RuntimeAuthUiMode;
+	}
+}