fix: keep active workers visible in sidebar

web/workspace/src/lib/workspace/console/worker-console.ui.test.ts

@@ -94,6 +94,9 @@ Deno.test("workspace Worker list lives on the dedicated Workers page", async ()
   const sidebar = await Deno.readTextFile(
     new URL("../sidebar/WorkspaceSidebar.svelte", import.meta.url),
   );
+  const sidebarCss = await Deno.readTextFile(
+    new URL("../sidebar/sidebar.css", import.meta.url),
+  );
 
   assert(
     workspacePage.includes("ticketsHref") &&
@@ -132,6 +135,17 @@ Deno.test("workspace Worker list lives on the dedicated Workers page", async ()
       !workersNav.includes('aria-disabled="true"'),
     "Workers sidebar should link to the Worker list page and show state indicators with repository/workdir metadata",
   );
+  assert(
+    workersNav.includes("COLLAPSED_WORKER_COUNT = 6") &&
+      workersNav.includes("workers.length > COLLAPSED_WORKER_COUNT") &&
+      workersNav.includes("aria-expanded={expanded}") &&
+      workersNav.includes("worker-overflow-chevron") &&
+      !workersNav.includes("MAX_VISIBLE_WORKERS") &&
+      sidebarCss.includes(".worker-overflow-toggle") &&
+      sidebarCss.includes('[aria-expanded="true"] .worker-overflow-chevron') &&
+      sidebarCss.includes("transform: rotate(180deg)"),
+    "Workers sidebar should collapse overflow behind a graphical chevron without dropping Workers",
+  );
   assert(
     !sidebar.includes("CompanionNavSection") &&
       sidebar.includes("TicketsNavSection") &&

web/workspace/src/lib/workspace/sidebar/WorkersNavSection.svelte

@@ -6,7 +6,7 @@
   } from './worker-subscription';
   import { canShowWorkerInSidebar } from './workers';
 
-  const MAX_VISIBLE_WORKERS = 6;
+  const COLLAPSED_WORKER_COUNT = 6;
 
   type Props = {
     currentPath?: string;
@@ -17,15 +17,21 @@
   let loading = $state(true);
   let error = $state<string | null>(null);
   let workers = $state<SidebarWorker[]>([]);
+  let expanded = $state(false);
+  let visibleWorkers = $derived(
+    expanded ? workers : workers.slice(0, COLLAPSED_WORKER_COUNT),
+  );
+  let hiddenWorkerCount = $derived(
+    Math.max(0, workers.length - COLLAPSED_WORKER_COUNT),
+  );
 
   $effect(() => {
+    expanded = false;
     const subscription = workspaceWorkersStore(workspaceId);
     return subscription.subscribe((state) => {
       loading = state.loading;
       error = state.error;
-      workers = state.workers
-        .filter(canShowWorkerInSidebar)
-        .slice(0, MAX_VISIBLE_WORKERS);
+      workers = state.workers.filter(canShowWorkerInSidebar);
     });
   });
 </script>
@@ -60,7 +66,7 @@
   {:else}
     {#if error}<p class="section-state error">{error}</p>{/if}
     <ul class="nav-list" aria-label="Workers">
-      {#each workers as worker (`${worker.runtime_id}:${worker.worker_id}`)}
+      {#each visibleWorkers as worker (`${worker.runtime_id}:${worker.worker_id}`)}
         {@const href = workerConsoleHref(worker, workspaceId)}
         <li>
           <a
@@ -84,5 +90,29 @@
         </li>
       {/each}
     </ul>
+    {#if workers.length > COLLAPSED_WORKER_COUNT}
+      <button
+        class="worker-overflow-toggle"
+        type="button"
+        aria-expanded={expanded}
+        aria-label={expanded
+          ? 'Collapse Worker list'
+          : `Show ${hiddenWorkerCount} more Workers`}
+        title={expanded
+          ? 'Collapse Worker list'
+          : `Show ${hiddenWorkerCount} more Workers`}
+        onclick={() => (expanded = !expanded)}
+      >
+        <span class="worker-overflow-line" aria-hidden="true"></span>
+        <svg
+          class="worker-overflow-chevron"
+          viewBox="0 0 24 24"
+          aria-hidden="true"
+        >
+          <path d="m6 9 6 6 6-6"></path>
+        </svg>
+        <span class="worker-overflow-line" aria-hidden="true"></span>
+      </button>
+    {/if}
   {/if}
 </section>

web/workspace/src/lib/workspace/sidebar/sidebar.css

@@ -277,6 +277,47 @@
     text-overflow: ellipsis;
     white-space: nowrap;
   }
+  .worker-overflow-toggle {
+    display: grid;
+    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
+    gap: var(--space-2);
+    width: 100%;
+    margin: var(--space-1) 0 0;
+    padding: var(--space-1) var(--space-2);
+    align-items: center;
+    border: 0;
+    border-radius: var(--radius-soft);
+    background: transparent;
+    color: var(--text-muted);
+    cursor: pointer;
+  }
+  .worker-overflow-toggle:hover,
+  .worker-overflow-toggle:focus-visible {
+    background: var(--interactive-hover);
+    color: var(--text-strong);
+  }
+  .worker-overflow-toggle:focus-visible {
+    outline: 1px solid var(--accent);
+    outline-offset: 1px;
+  }
+  .worker-overflow-line {
+    height: 1px;
+    background: currentColor;
+    opacity: 0.45;
+  }
+  .worker-overflow-chevron {
+    width: 0.875rem;
+    height: 0.875rem;
+    fill: none;
+    stroke: currentColor;
+    stroke-linecap: round;
+    stroke-linejoin: round;
+    stroke-width: 1.75;
+    transition: transform 140ms ease;
+  }
+  .worker-overflow-toggle[aria-expanded="true"] .worker-overflow-chevron {
+    transform: rotate(180deg);
+  }
   @keyframes worker-status-spin {
     to {
       transform: rotate(360deg);

web/workspace/src/lib/workspace/sidebar/workers.test.ts

@@ -66,7 +66,7 @@ Deno.test("live runtime workers are sidebar targets and console targets", () =>
   assertEquals(canOpenWorkerConsole(liveWorker), true);
 });
 
-Deno.test("sidebar workers sort idle then running then stopped", () => {
+Deno.test("sidebar workers sort running then idle then stopped", () => {
   const workers = [
     worker({ worker_id: "3", display_name: "Stopped", state: "stopped" }),
     worker({ worker_id: "2", display_name: "Running", state: "running" }),
@@ -74,5 +74,5 @@ Deno.test("sidebar workers sort idle then running then stopped", () => {
     worker({ worker_id: "1", display_name: "Idle A", state: "idle" }),
   ];
   workers.sort(compareWorkersForSidebar);
-  assertEquals(workers.map((candidate) => candidate.worker_id).join(","), "1,4,2,3");
+  assertEquals(workers.map((candidate) => candidate.worker_id).join(","), "2,1,4,3");
 });

web/workspace/src/lib/workspace/sidebar/workers.ts

@@ -15,9 +15,9 @@ type SortableWorker = Pick<
 
 function workerStateRank(state: Worker['state']): number {
   switch (state) {
-    case 'idle':
-      return 0;
     case 'running':
+      return 0;
+    case 'idle':
       return 1;
     case 'stopped':
       return 2;