major navbar overhaul: .btn-primary.btn-xl now reads CONT GAME and links to the user's most recently active game; log out functionality transferred to new BYE .btn-abandon abutting login spans; tooltips for each asserted via new FTs.test_navbar methods to appear w.in visible area

src/static_src/scss/_base.scss

@@ -41,7 +41,19 @@ body {
                 gap: 1rem;
                 margin-right: 0.5rem;
 
-                > form { flex-shrink: 0; margin-left: auto; }
+                .navbar-user {
+                    flex: 1;
+                    min-width: 0;
+                    display: flex;
+                    align-items: center;
+                    justify-content: center;
+                    gap: 0.25rem;
+
+                    .navbar-text { flex: none; }  // prevent expansion; BYE abuts the spans
+                    > form { flex-shrink: 0; order: -1; }  // BYE left of spans
+                }
+
+                > #id_cont_game { flex-shrink: 0; }
             }
 
             .navbar-text,
@@ -211,7 +223,15 @@ body {
             gap: 1rem;
             padding: 0 0.25rem;
 
-            > form { flex-shrink: 0; order: -1; }  // logout above brand
+            > #id_cont_game { flex-shrink: 0; order: -1; }  // cont-game above brand
+
+            .navbar-user {
+                flex-direction: column;
+                align-items: center;
+                gap: 0.25rem;
+                .navbar-text { margin: 0; }  // cancel landscape margin:auto so BYE abuts
+                > form { order: 0; .btn { margin-top: 0; } }  // abut spans
+            }
         }
 
         .navbar-brand h1 {