Polish server health checking feedback and bump Harbor versions

src/web/styles.css

@@ -2717,6 +2717,34 @@ p {
   text-align: center;
 }
 
+.client-server-health {
+  min-height: 14px;
+  display: grid;
+  place-items: center;
+}
+
+.client-server-health > span {
+  grid-area: 1 / 1;
+  transition: opacity 420ms ease, filter 520ms cubic-bezier(0.16, 1, 0.3, 1), color 520ms ease;
+}
+
+.client-server-health-checking {
+  color: var(--client-accent);
+  opacity: 0;
+  filter: blur(4px);
+  text-shadow: 0 0 8px color-mix(in oklch, var(--client-accent) 42%, transparent);
+}
+
+.client-server-health.is-checking > span:first-child {
+  opacity: 0.32;
+  filter: blur(2px);
+}
+
+.client-server-health.is-checking .client-server-health-checking {
+  opacity: 1;
+  filter: blur(0);
+}
+
 .client-servers.is-scalable {
   width: min(100%, 360px);
   margin-inline: auto;
@@ -2766,8 +2794,37 @@ p {
   border: 0;
   background: transparent;
   color: var(--client-muted);
-  font: 700 8px/1.2 'JetBrains Mono', 'SF Mono', ui-monospace, Menlo, monospace;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 6px;
+  font: 700 9px/1.2 'JetBrains Mono', 'SF Mono', ui-monospace, Menlo, monospace;
   cursor: pointer;
+  transition: color 300ms ease, opacity 300ms ease, text-shadow 500ms ease;
+}
+
+.client-server-check svg {
+  width: 13px;
+  height: 13px;
+  fill: none;
+  stroke: currentColor;
+  stroke-width: 1.6;
+  stroke-linecap: round;
+  stroke-linejoin: round;
+}
+
+.client-server-check.is-checking {
+  color: var(--client-accent);
+  opacity: 1;
+  text-shadow: 0 0 9px color-mix(in oklch, var(--client-accent) 46%, transparent);
+}
+
+.client-server-check.is-checking svg {
+  animation: client-server-check-spin 700ms linear infinite;
+}
+
+@keyframes client-server-check-spin {
+  to { transform: rotate(360deg); }
 }
 
 .client-server-check:hover:not(:disabled),
@@ -2782,6 +2839,9 @@ p {
 
 .client-server-check:disabled {
   cursor: default;
+}
+
+.client-server-check:disabled:not(.is-checking) {
   opacity: 0.55;
 }
 
@@ -3553,6 +3613,9 @@ p {
   .client-usage > strong,
   .client-server,
   .client-server-auto,
+  .client-server-health > span,
+  .client-server-check,
+  .client-server-check svg,
   .client-server-mode-toggle,
   .client-server-mode-toggle svg,
   .client-server-mode-panel,