feat: persistent sessions with 30-day JWT and auto-refresh on page load

Sessions now last 30 days instead of 15 minutes. Both the rstack-identity
component and legacy header auto-refresh the token when < 7 days remain,
so users who visit at least once every ~23 days stay logged in indefinitely.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/rspace-header.ts

@@ -898,6 +898,27 @@ export function mountHeader(options: HeaderOptions): void {
   // Mount to DOM
   document.body.prepend(header);
   renderHeader();
+
+  // Auto-refresh token if nearing expiry (< 7 days remaining)
+  (async () => {
+    const session = getSession();
+    if (!session) return;
+    const now = Math.floor(Date.now() / 1000);
+    const remaining = session.claims.exp - now;
+    if (remaining >= 7 * 24 * 60 * 60) return;
+    try {
+      const res = await fetch(`${ENCRYPTID_URL}/api/session/refresh`, {
+        method: 'POST',
+        headers: { Authorization: `Bearer ${session.accessToken}` },
+      });
+      if (!res.ok) return;
+      const { token } = await res.json();
+      if (token) {
+        storeSession(token, session.claims.username || '', session.claims.did || '');
+        renderHeader();
+      }
+    } catch { /* silently ignore */ }
+  })();
 }
 
 /**

shared/components/rstack-identity.ts

@@ -186,6 +186,7 @@ export class RStackIdentity extends HTMLElement {
 	}
 
 	connectedCallback() {
+		this.#refreshIfNeeded();
 		this.#render();
 		this.#startNotifPolling();
 	}
@@ -194,6 +195,26 @@ export class RStackIdentity extends HTMLElement {
 		this.#stopNotifPolling();
 	}
 
+	async #refreshIfNeeded() {
+		const session = getSession();
+		if (!session) return;
+		const now = Math.floor(Date.now() / 1000);
+		const remaining = session.claims.exp - now;
+		if (remaining >= 7 * 24 * 60 * 60) return; // more than 7 days left, skip
+		try {
+			const res = await fetch(`${ENCRYPTID_URL}/api/session/refresh`, {
+				method: "POST",
+				headers: { Authorization: `Bearer ${session.accessToken}` },
+			});
+			if (!res.ok) return;
+			const { token } = await res.json();
+			if (token) {
+				storeSession(token, session.claims.username || "", session.claims.did || "");
+				this.#render();
+			}
+		} catch { /* silently ignore – user keeps current token */ }
+	}
+
 	#startNotifPolling() {
 		this.#stopNotifPolling();
 		if (!getSession()) return;

src/encryptid/server.ts

@@ -90,7 +90,7 @@ const CONFIG = {
     if (!secret) throw new Error('JWT_SECRET environment variable is required');
     return secret;
   })(),
-  sessionDuration: 15 * 60,  // 15 minutes
+  sessionDuration: 30 * 24 * 60 * 60,  // 30 days
   refreshDuration: 7 * 24 * 60 * 60,  // 7 days
   smtp: {
     host: process.env.SMTP_HOST || 'mail.rmail.online',