Fix session cookie max-age bug; add UI hardening roadmap

Cookie max-age was 900s (15 min, matching access token) but refresh
token lives 7 days — users got bounced to login after 15 min idle
because the Go SSR middleware rejected the expired cookie before JS
could refresh. Now cookie max-age = 604800s (7 days) on both the
client (auth.js) and server (auth.go OIDC callback).

Go page-auth middleware accepts expired-but-signed JWTs via new
parseJWTIgnoringExpiry() so the page shell renders and the Preact SDK
can refresh client-side. API middleware still validates expiry strictly.
6 new middleware tests cover strict/lenient/tampered/garbage cases.

VERSION bumped to 0.6.8 (rebrand was already shipped but file missed).
ROADMAP-UI.md added with 7 milestones (v0.6.9–v0.6.15).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/middleware/auth_test.go

@@ -0,0 +1,82 @@
+package middleware
+
+import (
+	"testing"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+const testSecret = "test-jwt-secret-key"
+
+func makeToken(t *testing.T, userID, email string, expiresAt time.Time) string {
+	t.Helper()
+	claims := Claims{
+		UserID: userID,
+		Email:  email,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(expiresAt),
+			IssuedAt:  jwt.NewNumericDate(time.Now().Add(-1 * time.Hour)),
+			ID:        "test-jti",
+		},
+	}
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	s, err := token.SignedString([]byte(testSecret))
+	if err != nil {
+		t.Fatal(err)
+	}
+	return s
+}
+
+func TestParseAndValidateJWT_Valid(t *testing.T) {
+	tok := makeToken(t, "u1", "a@b.com", time.Now().Add(15*time.Minute))
+	claims, ok := parseAndValidateJWT(tok, testSecret)
+	if !ok {
+		t.Fatal("expected valid token to parse")
+	}
+	if claims.UserID != "u1" {
+		t.Errorf("UserID = %q, want u1", claims.UserID)
+	}
+}
+
+func TestParseAndValidateJWT_Expired(t *testing.T) {
+	tok := makeToken(t, "u1", "a@b.com", time.Now().Add(-5*time.Minute))
+	_, ok := parseAndValidateJWT(tok, testSecret)
+	if ok {
+		t.Fatal("expected expired token to be rejected by strict parser")
+	}
+}
+
+func TestParseAndValidateJWT_WrongSecret(t *testing.T) {
+	tok := makeToken(t, "u1", "a@b.com", time.Now().Add(15*time.Minute))
+	_, ok := parseAndValidateJWT(tok, "wrong-secret")
+	if ok {
+		t.Fatal("expected wrong-secret token to be rejected")
+	}
+}
+
+func TestParseJWTIgnoringExpiry_Expired(t *testing.T) {
+	tok := makeToken(t, "u1", "a@b.com", time.Now().Add(-5*time.Minute))
+	claims, ok := parseJWTIgnoringExpiry(tok, testSecret)
+	if !ok {
+		t.Fatal("expected expired token to be accepted by lenient parser")
+	}
+	if claims.UserID != "u1" {
+		t.Errorf("UserID = %q, want u1", claims.UserID)
+	}
+}
+
+func TestParseJWTIgnoringExpiry_WrongSecret(t *testing.T) {
+	tok := makeToken(t, "u1", "a@b.com", time.Now().Add(-5*time.Minute))
+	_, ok := parseJWTIgnoringExpiry(tok, "wrong-secret")
+	if ok {
+		t.Fatal("expected tampered token to be rejected even with lenient parser")
+	}
+}
+
+func TestParseJWTIgnoringExpiry_GarbageToken(t *testing.T) {
+	_, ok := parseJWTIgnoringExpiry("not.a.jwt", testSecret)
+	if ok {
+		t.Fatal("expected garbage token to be rejected")
+	}
+}