Fix agent Manage modal: drop unusable Pause, declutter layout

Pulse Agents push telemetry to Pulse, so there is no pause concept for
them: the backend hardcodes agent connections to Enabled=true with
SupportsPause=false, and the frontend setEnabled() throws
'Pause is not supported for agent connections' before any request is
sent. The agent Manage dialog still rendered an enabled 'Pause
connection' button (and an 'Enabled' status pill implying a toggle),
so the button could only ever surface that error. Remove both from the
agent panel. Pause stays for API-pulled sources (pve/pbs/pmg/vmware/
truenas), where it genuinely stops polling.

Remove source is unchanged and works: it calls DELETE
/api/agents/agent/{id}, which drops the host from state, revokes the
agent token, and blocklists the host so future reports are rejected
until 'Allow reconnect'. The dialog already explains the host keeps
running until uninstalled.

Also declutter the dialog the user flagged as 'weird':
- Drop the redundant summary header (name, 'Pulse Agent' eyebrow, OS,
  endpoint) that duplicated the dialog title/subtitle and the info
  cards below it.
- Clamp the uninstall command previews to 3 lines so the long Windows
  PowerShell one-liner no longer dominates the modal; the Copy buttons
  still deliver the full command.

frontend-modern/src/components/Settings/InfrastructureWorkspace.tsx

@@ -23,7 +23,6 @@ import {
 import { InfrastructureSourceManager } from './InfrastructureSourceManager';
 import { InfrastructureSourcePicker } from './InfrastructureSourcePicker';
 import {
-  connectionAgentEndpointDisplay,
   connectionAgentIdentitySummary,
   connectionAgentVersionPresentation,
   connectionLastActivityText,
@@ -361,13 +360,11 @@ const InfrastructureWorkspaceContent: Component<InfrastructureWorkspaceProps> =
   );
 
   const renderAgentConnectionDetails = (connection: Connection) => {
-    const pausePending = () => rowActions.pendingAction(connection.id) === 'pause';
     const removePending = () => rowActions.pendingAction(connection.id) === 'remove';
     const removeConfirming = () => rowActions.confirmingRemove(connection.id);
     const error = () => rowActions.actionError(connection.id);
     const versionPresentation = () => connectionAgentVersionPresentation(connection);
     const identitySummary = () => connectionAgentIdentitySummary(connection);
-    const endpointDisplay = () => connectionAgentEndpointDisplay(connection);
     const infoCard = (label: string, value: string) => (
       <div class="rounded-lg border border-border bg-surface-alt px-3 py-3">
         <div class="text-[11px] font-medium uppercase tracking-wide text-muted">{label}</div>
@@ -378,25 +375,7 @@ const InfrastructureWorkspaceContent: Component<InfrastructureWorkspaceProps> =
     return (
       <div class="space-y-6 p-4">
         <section class="rounded-xl border border-border bg-surface p-4">
-          <div class="flex flex-wrap items-start justify-between gap-4">
-            <div class="space-y-1">
-              <div class="text-[11px] font-medium uppercase tracking-wide text-muted">
-                Pulse Agent
-              </div>
-              <div class="text-lg font-semibold text-base-content">{connection.name}</div>
-              <Show when={identitySummary()}>
-                {(summary) => <div class="text-sm text-muted">{summary()}</div>}
-              </Show>
-              <Show when={endpointDisplay()}>
-                {(endpoint) => <div class="break-words text-sm text-muted">{endpoint()}</div>}
-              </Show>
-            </div>
-            <span class="inline-flex items-center rounded-full border border-border bg-surface-alt px-2.5 py-1 text-xs font-medium text-base-content">
-              {connection.enabled ? 'Enabled' : 'Paused'}
-            </span>
-          </div>
-
-          <div class="mt-4 grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
+          <div class="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
             {infoCard('Connection state', connection.state)}
             {infoCard('Last seen', connection.lastSeen ? connection.lastSeen : 'No activity yet')}
             <Show when={versionPresentation()}>
@@ -459,7 +438,7 @@ const InfrastructureWorkspaceContent: Component<InfrastructureWorkspaceProps> =
                 <div class="text-[11px] font-medium uppercase tracking-wide text-muted">
                   Linux / macOS / FreeBSD
                 </div>
-                <div class="mt-1 break-all font-mono text-[11px] text-base-content">
+                <div class="mt-1 line-clamp-3 break-all font-mono text-[11px] text-base-content">
                   {agentUninstallCommands().linux}
                 </div>
                 <button
@@ -475,7 +454,7 @@ const InfrastructureWorkspaceContent: Component<InfrastructureWorkspaceProps> =
                 <div class="text-[11px] font-medium uppercase tracking-wide text-muted">
                   Windows PowerShell
                 </div>
-                <div class="mt-1 break-all font-mono text-[11px] text-base-content">
+                <div class="mt-1 line-clamp-3 break-all font-mono text-[11px] text-base-content">
                   {agentUninstallCommands().windows}
                 </div>
                 <button
@@ -509,24 +488,10 @@ const InfrastructureWorkspaceContent: Component<InfrastructureWorkspaceProps> =
         </Show>
 
         <div class="flex flex-col-reverse gap-2 sm:flex-row sm:justify-end">
-          <button
-            type="button"
-            onClick={() => void rowActions.togglePause(connection)}
-            disabled={pausePending() || removePending()}
-            class={buttonClass}
-          >
-            {pausePending()
-              ? connection.enabled
-                ? 'Pausing…'
-                : 'Resuming…'
-              : connection.enabled
-                ? 'Pause connection'
-                : 'Resume connection'}
-          </button>
           <button
             type="button"
             onClick={() => void rowActions.requestRemove(connection)}
-            disabled={pausePending() || removePending()}
+            disabled={removePending()}
             class={
               removeConfirming()
                 ? 'inline-flex min-h-10 sm:min-h-9 items-center justify-center rounded-md bg-rose-600 px-3 py-2 text-sm font-medium text-white transition-colors hover:bg-rose-700 disabled:cursor-not-allowed disabled:opacity-60'