fix(desktop): improve renderer recovery prompt

Co-authored-by: multica-agent <github@multica.ai>

apps/desktop/src/main/renderer-recovery.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it, vi, beforeEach, afterEach } from "vitest";
-import { installRendererRecoveryHandlers } from "./renderer-recovery";
+import { createElectronReloadPrompt, installRendererRecoveryHandlers } from "./renderer-recovery";
 
 type Handler = (...args: unknown[]) => void;
 
@@ -109,4 +109,30 @@ describe("installRendererRecoveryHandlers", () => {
     expect(showReloadPrompt).not.toHaveBeenCalled();
     expect(fixture.reload).not.toHaveBeenCalled();
   });
+
+  it("shows actionable recovery guidance before diagnostic details", async () => {
+    let detail = "";
+    const showMessageBox = vi.fn(
+      async (options: { title: string; message: string; detail: string }) => {
+        detail = options.detail;
+        return { response: 1 };
+      },
+    );
+    const showReloadPrompt = createElectronReloadPrompt(showMessageBox);
+
+    await showReloadPrompt({ kind: "unresponsive", context: {} });
+
+    expect(showMessageBox).toHaveBeenCalledWith(
+      expect.objectContaining({
+        title: "Multica needs to reload",
+        message: "The desktop window has been stuck for a few seconds.",
+        detail: expect.stringContaining(
+          "Click Reload to refresh this window and keep using Multica.",
+        ),
+      }),
+    );
+    expect(detail).toContain("what you were doing right before this message appeared");
+    expect(detail).toContain("Activity Monitor sample");
+    expect(detail).toContain("Diagnostic details:\nkind: unresponsive\ncontext: {}");
+  });
 });

apps/desktop/src/main/renderer-recovery.ts

@@ -109,18 +109,30 @@ function isRecoverableRendererExit(details: unknown) {
 function rendererRecoveryMessage(kind: ReloadPromptPayload["kind"]) {
   switch (kind) {
     case "render-process-gone":
-      return "The desktop renderer process stopped responding or crashed.";
+      return "The desktop window stopped unexpectedly.";
     case "preload-error":
-      return "The desktop preload script failed before the app could start.";
+      return "The desktop window could not finish starting.";
     case "unresponsive":
-      return "The desktop window is not responding.";
+      return "The desktop window has been stuck for a few seconds.";
   }
 }
 
 function rendererRecoveryDetail(payload: ReloadPromptPayload) {
+  const guidance = [
+    "Click Reload to refresh this window and keep using Multica.",
+    "If this keeps happening, please tell us what you were doing right before this message appeared and whether Reload recovered the window.",
+  ];
+
+  if (payload.kind === "unresponsive") {
+    guidance.push(
+      "For macOS reports, an Activity Monitor sample of the Multica Helper (Renderer) process helps us find what blocked the app.",
+    );
+  }
+
   return [
-    "Reloading is the safest recovery path for this window.",
+    ...guidance,
     "",
+    "Diagnostic details:",
     `kind: ${payload.kind}`,
     `context: ${JSON.stringify(payload.context)}`,
   ].join("\n");
@@ -132,4 +144,4 @@ function defaultDevLog(tag: string, ...args: unknown[]) {
 
 function formatError(error: unknown) {
   return error instanceof Error ? (error.stack ?? error.message) : String(error);
-}
+}