Fix Capacitor build: skip OAuth redirects during static build

The adapter-static fallback generation was failing with status 302
because hooks.server.ts was triggering OAuth redirects during the
build phase. Added a check for the `building` flag to skip these
redirects during static site generation.

Author: claude

src/hooks.server.ts

@@ -144,7 +144,10 @@ export const handle: Handle = async ({ event, resolve }) => {
 	event.locals.sessionId = auth.sessionId;
 
 	if (loginEnabled && !auth.user && !event.url.pathname.startsWith(`${base}/.well-known/`)) {
-		if (config.AUTOMATIC_LOGIN === "true") {
+		// Skip OAuth redirects during static builds (Capacitor fallback generation)
+		if (building) {
+			// Allow the request to proceed without authentication during build
+		} else if (config.AUTOMATIC_LOGIN === "true") {
 			// AUTOMATIC_LOGIN: always redirect to OAuth flow (unless already on login or healthcheck pages)
 			if (
 				!event.url.pathname.startsWith(`${base}/login`) &&