Add activity logs, sidebar badges, and logout with working alert colors.

Record auth audits and surface them in Activity, poll sidebar counts without resetting idle, and add a profile logout path plus theme red/green/blue tokens so failure badges render.

service/internal/settings/auth_audit_test.go

@@ -0,0 +1,81 @@
+package settings
+
+import (
+	"testing"
+	"time"
+)
+
+func TestAuthAuditRoundTripAndCap(t *testing.T) {
+	dir := t.TempDir()
+
+	store, err := LoadAuthAuditOrEmpty(dir)
+	if err != nil {
+		t.Fatalf("LoadAuthAuditOrEmpty: %v", err)
+	}
+	if len(store.Events) != 0 {
+		t.Fatalf("expected empty, got %d", len(store.Events))
+	}
+
+	event := AuthAuditEvent{
+		ID:       "evt-1",
+		At:       time.Now().UTC(),
+		Action:   "login",
+		Outcome:  AuthAuditOutcomeSuccess,
+		Category: AuthAuditCategoryAuth,
+		Actor:    "admin",
+	}
+	if err := AppendAuthAuditEvent(dir, event); err != nil {
+		t.Fatalf("AppendAuthAuditEvent: %v", err)
+	}
+
+	loaded, err := LoadAuthAudit(dir)
+	if err != nil {
+		t.Fatalf("LoadAuthAudit: %v", err)
+	}
+	if len(loaded.Events) != 1 || loaded.Events[0].Action != "login" {
+		t.Fatalf("loaded = %+v", loaded)
+	}
+	if loaded.Events[0].Outcome != AuthAuditOutcomeSuccess {
+		t.Fatalf("outcome = %q", loaded.Events[0].Outcome)
+	}
+}
+
+func TestAppendAuthAuditEventTrimsToCap(t *testing.T) {
+	dir := t.TempDir()
+	originalCap := MaxAuthAuditEvents
+	store := AuthAuditStore{Events: make([]AuthAuditEvent, 0, MaxAuthAuditEvents+5)}
+	for index := 0; index < MaxAuthAuditEvents+5; index++ {
+		store.Events = append(store.Events, AuthAuditEvent{
+			ID:       "evt",
+			At:       time.Now().UTC(),
+			Action:   "login",
+			Outcome:  AuthAuditOutcomeSuccess,
+			Category: AuthAuditCategoryAuth,
+			Actor:    "admin",
+			Detail:   string(rune('a' + (index % 26))),
+		})
+	}
+	if err := SaveAuthAudit(dir, store); err != nil {
+		t.Fatalf("SaveAuthAudit: %v", err)
+	}
+	if err := AppendAuthAuditEvent(dir, AuthAuditEvent{
+		ID:       "newest",
+		At:       time.Now().UTC(),
+		Action:   "logout",
+		Outcome:  AuthAuditOutcomeSuccess,
+		Category: AuthAuditCategoryAuth,
+		Actor:    "admin",
+	}); err != nil {
+		t.Fatalf("AppendAuthAuditEvent: %v", err)
+	}
+	loaded, err := LoadAuthAudit(dir)
+	if err != nil {
+		t.Fatalf("LoadAuthAudit: %v", err)
+	}
+	if len(loaded.Events) != originalCap {
+		t.Fatalf("len = %d, want %d", len(loaded.Events), originalCap)
+	}
+	if loaded.Events[len(loaded.Events)-1].ID != "newest" {
+		t.Fatalf("last id = %q", loaded.Events[len(loaded.Events)-1].ID)
+	}
+}