feat: add feature to monitor background agents (#125)

Also includes a fix to persist configuration across reconnects.

Reviewed-on: #125
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/lib/components/StatusBar.svelte

@@ -21,9 +21,11 @@
   import HelpPanel from "./HelpPanel.svelte";
   import KeyboardShortcutsModal from "./KeyboardShortcutsModal.svelte";
   import { achievementProgress } from "$lib/stores/achievements";
+  import { runningAgentCount } from "$lib/stores/agents";
   import SessionHistoryPanel from "./SessionHistoryPanel.svelte";
   import GitPanel from "./GitPanel.svelte";
   import ProfilePanel from "./ProfilePanel.svelte";
+  import AgentMonitorPanel from "./AgentMonitorPanel.svelte";
   import { conversationsStore } from "$lib/stores/conversations";
   import {
     generateContextInjection,
@@ -48,8 +50,10 @@
   let showSessionHistory = $state(false);
   let showGitPanel = $state(false);
   let showProfile = $state(false);
+  let showAgentMonitor = $state(false);
   let isSummarising = $state(false);
   const progress = $derived($achievementProgress);
+  const activeAgentCount = $derived($runningAgentCount);
   let currentConfig: HikariConfig = $state({
     model: null,
     api_key: null,
@@ -466,6 +470,29 @@
         />
       </svg>
     </button>
+    <button
+      onclick={() => (showAgentMonitor = !showAgentMonitor)}
+      class="p-1 text-gray-500 icon-trans-hover relative {showAgentMonitor
+        ? 'text-[var(--trans-pink)]'
+        : ''}"
+      title="Agent Monitor"
+    >
+      <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M9 3v2m6-2v2M9 19v2m6-2v2M5 9H3m2 6H3m18-6h-2m2 6h-2M7 19h10a2 2 0 002-2V7a2 2 0 00-2-2H7a2 2 0 00-2 2v10a2 2 0 002 2zM9 9h6v6H9V9z"
+        />
+      </svg>
+      {#if activeAgentCount > 0}
+        <span
+          class="absolute -top-1 -right-1 bg-blue-500 text-white text-xs rounded-full w-4 h-4 flex items-center justify-center text-[10px] animate-pulse"
+        >
+          {activeAgentCount}
+        </span>
+      {/if}
+    </button>
     <button
       onclick={() => (showStats = !showStats)}
       class="p-1 text-gray-500 icon-trans-hover {showStats ? 'text-[var(--trans-pink)]' : ''}"
@@ -638,3 +665,7 @@
 {#if showProfile}
   <ProfilePanel onClose={() => (showProfile = false)} />
 {/if}
+
+{#if showAgentMonitor}
+  <AgentMonitorPanel isOpen={showAgentMonitor} onClose={() => (showAgentMonitor = false)} />
+{/if}