Stabilize multi-peer UI and fix container start API body

Keep the containers table scoped to the active peer with a merge store,
restore the last active server on boot with a restoring screen, start
containers without a Docker API body (v1.24+), and stop ⋮ menus from
sticking to the viewport bottom after refreshes.

ui/modern.css

@@ -402,7 +402,8 @@ body {
   position: relative;
 }
 
-#content > #welcome-page {
+#content > #welcome-page,
+#content > #restoring-page {
   margin: auto;
 }
 
@@ -1432,6 +1433,44 @@ body {
   animation: none !important;
 }
 
+/* ─── Restoring connections (boot) ─── */
+#restoring-page {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  text-align: center;
+  max-width: 520px;
+  width: min(520px, 92%);
+  margin: auto;
+  padding: 48px 36px;
+  background:
+    linear-gradient(160deg, rgba(52, 211, 153, 0.1) 0%, rgba(15, 19, 26, 0.9) 45%),
+    var(--bg-elevated);
+  border: 1px solid var(--border-strong);
+  border-radius: var(--border-radius-lg);
+  box-shadow: var(--shadow-lg), 0 0 80px rgba(52, 211, 153, 0.08);
+  animation: welcomeIn 0.4s ease-out;
+}
+
+#restoring-page.hidden,
+#restoring-page[hidden],
+#restoring-page.is-hidden {
+  display: none !important;
+  visibility: hidden !important;
+  pointer-events: none !important;
+  animation: none !important;
+}
+
+#restoring-page h1 {
+  margin: 1rem 0 0.5rem;
+  font-size: 1.5rem;
+}
+
+#restoring-page .restoring-spinner {
+  margin-bottom: 0.25rem;
+}
+
 @keyframes welcomeIn {
   from {
     opacity: 0;
@@ -2066,11 +2105,16 @@ textarea::placeholder {
 }
 
 /*
- * ⋮ menu must escape .table-responsive overflow (which clips absolute menus
- * and stacks under following rows). Popper strategy:fixed + high z-index.
+ * ⋮ more-actions menu: use static display (no Popper fixed) so menus stay
+ * anchored to the row and never stick to the bottom of the viewport after
+ * list refreshes. Elevate the open row above neighbors; never clip the menu.
  */
 .container-actions-more {
-  position: relative;
+  position: static;
+}
+
+.container-actions-cell .dropdown {
+  position: static;
 }
 
 .container-actions .dropdown-menu,
@@ -2081,29 +2125,61 @@ textarea::placeholder {
   box-shadow: var(--shadow-lg);
   border: 1px solid var(--border-strong);
   background: var(--bg-elevated) !important;
+  /* Anchor to the actions cell, open upward when near table bottom */
+  position: absolute !important;
+  inset: auto auto 100% auto !important;
+  top: auto !important;
+  left: auto !important;
+  right: 0 !important;
+  bottom: 100% !important;
+  margin: 0 0 4px 0 !important;
+  transform: none !important;
+}
+
+/* Closed menus must never paint (Popper leftovers / list refresh desync) */
+.container-actions .dropdown-menu:not(.show),
+.container-actions-dropdown-menu:not(.show) {
+  display: none !important;
+  visibility: hidden !important;
+  pointer-events: none !important;
 }
 
 /* Elevate the open row so the menu paints above neighboring table rows */
 #container-list > tr:has(.container-actions-more.show),
-#container-list > tr:has(.dropdown-menu.show) {
+#container-list > tr:has(.dropdown-menu.show),
+#container-list > tr:has(.dropdown.show) {
   position: relative;
-  z-index: 6;
+  z-index: 20;
 }
 
 #container-list > tr:has(.container-actions-more.show) > td,
-#container-list > tr:has(.dropdown-menu.show) > td {
+#container-list > tr:has(.dropdown-menu.show) > td,
+#container-list > tr:has(.dropdown.show) > td {
   background: var(--bg-elevated);
+  overflow: visible;
 }
 
-/* Allow the table area to not clip fixed-strategy menus as badly on Y */
+/* Do not clip row action menus */
 #containers-view .table-responsive {
   overflow-x: auto;
   overflow-y: visible;
-  /* Create a stacking context that still allows fixed children above chrome */
   position: relative;
   z-index: 1;
 }
 
+#containers-view .table {
+  overflow: visible;
+}
+
+#containers-view #container-list > tr > td {
+  overflow: visible;
+}
+
+/* Accordion bodies must stay collapsed when not .show (defensive vs BS CDN lag) */
+.accordion-collapse.collapse:not(.show) {
+  display: none !important;
+}
+
 /* Activity history tray */
 .activity-tray {
   position: relative;