fix(ui): show workspace launch errors in dialog

packages/ui/src/stores/instances.ts

@@ -35,6 +35,7 @@ import { upsertPermissionV2, removePermissionV2, upsertQuestionV2, removeQuestio
 import { clearCacheForInstance } from "../lib/global-cache"
 import { getLogger } from "../lib/logger"
 import { mergeInstanceMetadata, clearInstanceMetadata } from "./instance-metadata"
+import { showWorkspaceLaunchError } from "./launch-errors"
 
 const log = getLogger("api")
 
@@ -372,6 +373,7 @@ function handleWorkspaceEvent(event: WorkspaceEventPayload) {
       break
     case "workspace.error":
       upsertWorkspace(event.workspace)
+      showWorkspaceLaunchError(event.workspace)
       break
     case "workspace.stopped":
       releaseInstanceResources(event.workspaceId)

packages/ui/src/stores/launch-errors.ts

@@ -0,0 +1,53 @@
+import { createSignal } from "solid-js"
+import type { WorkspaceDescriptor } from "../../../server/src/api-types"
+import { tGlobal } from "../lib/i18n"
+import { formatLaunchErrorMessage, isMissingBinaryMessage } from "../lib/launch-errors"
+
+type LaunchErrorSource = "create" | "workspace"
+
+export interface LaunchErrorState {
+  source: LaunchErrorSource
+  message: string
+  binaryPath: string
+  missingBinary: boolean
+  instanceId?: string
+}
+
+const [launchError, setLaunchError] = createSignal<LaunchErrorState | null>(null)
+
+// Avoid spamming the user with the same modal on repeated events.
+const lastWorkspaceErrorByInstanceId = new Map<string, string>()
+
+export function showLaunchError(next: LaunchErrorState) {
+  setLaunchError(next)
+}
+
+export function clearLaunchError() {
+  setLaunchError(null)
+}
+
+export function showWorkspaceLaunchError(workspace: WorkspaceDescriptor) {
+  const instanceId = workspace.id
+  const rawMessage = workspace.error
+  const message = formatLaunchErrorMessage(rawMessage, tGlobal("app.launchError.fallbackMessage"))
+
+  const previous = lastWorkspaceErrorByInstanceId.get(instanceId)
+  if (previous && previous === message) {
+    return
+  }
+
+  lastWorkspaceErrorByInstanceId.set(instanceId, message)
+
+  const binaryPath = (workspace.binaryLabel || workspace.binaryId || "opencode").trim() || "opencode"
+  const missingBinary = isMissingBinaryMessage(message)
+
+  showLaunchError({
+    source: "workspace",
+    instanceId,
+    message,
+    binaryPath,
+    missingBinary,
+  })
+}
+
+export { launchError }