Harden account import/continuous behavior and finish multi-account UI polish

webui/style.css

@@ -638,6 +638,10 @@ tbody tr:hover {
   padding: 16px 24px;
   border-bottom: 1px solid var(--line);
   background: #050505;
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 16px;
 }
 
 .viewer-header h2 {
@@ -647,6 +651,31 @@ tbody tr:hover {
   letter-spacing: -0.04em;
 }
 
+.viewer-tools {
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  gap: 8px;
+  flex-wrap: wrap;
+}
+
+.viewer-tools input[type="search"] {
+  min-width: min(260px, 40vw);
+}
+
+.viewer-auto-refresh {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  min-height: 34px;
+  color: var(--dim);
+  font-size: 0.82rem;
+}
+
+.viewer-auto-refresh input {
+  min-width: auto;
+}
+
 .messages-list {
   flex: 1;
   overflow-y: auto;
@@ -852,6 +881,54 @@ tbody tr:hover {
   display: none;
 }
 
+.empty-state,
+.viewer-empty-state {
+  padding: 16px;
+  color: var(--dim);
+  border: 1px solid var(--line);
+  border-radius: 14px;
+  background: #0a0a0a;
+}
+
+.viewer-empty-state {
+  align-self: center;
+  margin-top: 16px;
+}
+
+.toast-root {
+  position: fixed;
+  right: 18px;
+  bottom: 18px;
+  z-index: 1000;
+  display: grid;
+  gap: 8px;
+  width: min(360px, calc(100vw - 36px));
+}
+
+.toast {
+  padding: 12px 14px;
+  border: 1px solid var(--line);
+  border-radius: 14px;
+  background: #111;
+  color: var(--text-color);
+  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.36);
+  transition: opacity 0.2s ease, transform 0.2s ease;
+}
+
+.toast-success {
+  border-color: #1f5b52;
+}
+
+.toast-error {
+  border-color: #7a2a2a;
+  color: #ffd4d4;
+}
+
+.toast-hide {
+  opacity: 0;
+  transform: translateY(8px);
+}
+
 .api-docs {
   display: grid;
   gap: 16px;
@@ -1030,6 +1107,16 @@ tbody tr:hover {
   background: #0f0f0f;
 }
 
+.import-account-row {
+  display: grid;
+  gap: 8px;
+  margin-top: 10px;
+  padding: 12px;
+  border: 1px solid var(--line);
+  border-radius: 16px;
+  background: #0f0f0f;
+}
+
 /* ── Active Account Card ─────────────────────────────── */
 
 #active-account-name {