web: server-screen, footer, monitoring-sidebar, and responsive-header polish (#1683)

Closes #1682

Server-screen, footer, monitoring-sidebar, and responsive-header polish: connected-card highlight/scroll + Failed status, footer row + MCP-docs tooltip, Servers box, card-surface refresh (gray-0 entry cards + white code), monitoring-sidebar layout, a 1280px responsive floor honored by the header (always-icon Disconnect, always-SegmentedControl tabs, 1500px status text, always-available sidebar), a horizontally-scrollable long resource URI in the compact Protocol entry, and copy buttons beside resource URIs / network URLs.

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clients/web/src/components/screens/ProtocolScreen/ProtocolScreen.tsx

@@ -41,7 +41,7 @@ export interface ProtocolUiState {
 
 const ScreenLayout = Flex.withProps({
   variant: "screen",
-  h: "calc(100dvh - var(--app-shell-header-height, 0px))",
+  h: "calc(100dvh - var(--app-shell-header-height, 0px) - var(--app-shell-footer-height, 0px))",
   gap: "md",
   p: "xl",
 });
@@ -107,7 +107,7 @@ export function ProtocolScreen({
     // See LoggingScreen: only override `h` when embedded, so the standalone
     // screen keeps ScreenLayout's default full-screen height (a `h={undefined}`
     // would clobber it and collapse an empty screen to its controls' height).
-    <ScreenLayout {...(embedded ? { h: "100%" } : {})}>
+    <ScreenLayout {...(embedded ? { h: "100%", pt: "md" } : {})}>
       {embedded ? null : (
         <Sidebar>
           <SidebarCard>