improve(ui): restyle connection-lost pill as neutral status surface (#101844)

ui/src/components/connection-banner.ts

@@ -3,7 +3,6 @@
 import { LitElement, html, nothing } from "lit";
 import { property } from "lit/decorators.js";
 import { t } from "../i18n/index.ts";
-import { icons } from "./icons.ts";
 import { redactLoginFailureError } from "./login-gate.ts";
 
 export type ConnectionBannerProps = {
@@ -17,11 +16,11 @@ function renderConnectionBanner(props: ConnectionBannerProps) {
   return html`
     <div class="connection-banner" role="status" aria-live="polite">
       <div class="connection-banner__pill" title=${detail ? `${hint}\n${detail}` : hint}>
-        <span class="connection-banner__spinner" aria-hidden="true">${icons.loader}</span>
-        <strong class="connection-banner__title">${t("connection.lostTitle")}</strong>
+        <span class="connection-banner__dot" aria-hidden="true"></span>
+        <span class="connection-banner__title">${t("connection.lostTitle")}</span>
         <span class="connection-banner__state">${t("connection.reconnecting")}</span>
         <span class="connection-banner__sr-hint">${hint}</span>
-        <button class="btn btn--sm connection-banner__retry" type="button" @click=${props.onRetry}>
+        <button class="connection-banner__retry" type="button" @click=${props.onRetry}>
           ${t("connection.retryNow")}
         </button>
       </div>

ui/src/styles/components.css

@@ -327,25 +327,22 @@
   pointer-events: none;
 }
 
+/* Neutral elevated surface; the amber status dot is the only color accent so
+   the pill reads as quiet system status, not a warning callout. */
 .connection-banner__pill {
   pointer-events: auto;
   display: inline-flex;
-  align-items: center;
-  gap: 10px;
+  align-items: stretch;
   min-width: 0;
   max-width: 100%;
-  padding: 6px 6px 6px 14px;
   border-radius: var(--radius-full);
-  border: 1px solid color-mix(in srgb, var(--warn) 36%, var(--border));
-  background: color-mix(
-    in srgb,
-    var(--warn) 10%,
-    color-mix(in srgb, var(--bg-elevated) 86%, transparent)
-  );
-  backdrop-filter: blur(12px) saturate(1.4);
-  -webkit-backdrop-filter: blur(12px) saturate(1.4);
-  box-shadow: var(--shadow-md);
+  border: 1px solid var(--border);
+  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
+  backdrop-filter: blur(12px) saturate(1.2);
+  -webkit-backdrop-filter: blur(12px) saturate(1.2);
+  box-shadow: var(--shadow-lg);
   font-size: 13px;
+  line-height: 1;
   animation: connection-banner-enter 0.25s var(--ease-out);
 }
 
@@ -366,35 +363,30 @@
   }
 }
 
-.connection-banner__spinner {
-  display: inline-flex;
-  align-items: center;
-  color: var(--warn);
-}
-
-.connection-banner__spinner svg {
-  width: 14px;
-  height: 14px;
-  fill: none;
-  stroke: currentColor;
-  stroke-width: 2;
-  stroke-linecap: round;
-  animation: connection-banner-spin 1s linear infinite;
-}
-
-@keyframes connection-banner-spin {
-  to {
-    transform: rotate(360deg);
-  }
+.connection-banner__dot {
+  width: 7px;
+  height: 7px;
+  align-self: center;
+  margin-left: 14px;
+  border-radius: var(--radius-full);
+  background: var(--warn);
+  box-shadow: 0 0 8px color-mix(in srgb, var(--warn) 55%, transparent);
+  animation: pulse-subtle 2s ease-in-out infinite;
+  flex-shrink: 0;
 }
 
 .connection-banner__title {
+  align-self: center;
+  margin-left: 9px;
+  padding: 10px 0;
   color: var(--text-strong);
-  font-weight: 600;
+  font-weight: 500;
   white-space: nowrap;
 }
 
 .connection-banner__state {
+  align-self: center;
+  margin-left: 7px;
   color: var(--muted);
   white-space: nowrap;
 }
@@ -412,19 +404,30 @@
   white-space: nowrap;
 }
 
-.connection-banner .connection-banner__retry {
-  border-radius: var(--radius-full);
-  border-color: color-mix(in srgb, var(--warn) 42%, var(--border));
+/* Text action behind a hairline divider so the pill stays a single surface
+   instead of a capsule-inside-a-capsule. */
+.connection-banner__retry {
+  margin-left: 12px;
+  padding: 0 14px;
+  border: none;
+  border-left: 1px solid var(--border);
+  border-radius: 0 var(--radius-full) var(--radius-full) 0;
   background: transparent;
-  color: var(--text-strong);
-  font-size: 12px;
-  padding: 4px 12px;
+  color: var(--accent);
+  font-size: 12.5px;
+  font-weight: 500;
   white-space: nowrap;
+  cursor: pointer;
+  transition: background var(--duration-fast) var(--ease-out);
 }
 
-.connection-banner .connection-banner__retry:hover:not(:disabled) {
-  border-color: color-mix(in srgb, var(--warn) 60%, var(--border));
-  background: color-mix(in srgb, var(--warn) 14%, transparent);
+.connection-banner__retry:hover {
+  background: color-mix(in srgb, var(--bg-hover) 84%, transparent);
+}
+
+.connection-banner__retry:focus-visible {
+  outline: none;
+  box-shadow: var(--focus-ring);
 }
 
 @media (max-width: 640px) {