Keep signer-not-responding toast; drop only the dead Details action button

src/routes/+layout.svelte

@@ -12,7 +12,7 @@
   import {goto} from "$app/navigation"
   import {page} from "$app/stores"
   import {context as pomadeContext} from "@pomade/core"
-  import {sync} from "@welshman/store"
+  import {sync, throttled} from "@welshman/store"
   import {setNip55Plugin} from "@welshman/signer"
   import * as util from "@welshman/util"
   import * as lib from "@welshman/lib"
@@ -26,6 +26,7 @@
   import {setupLogging} from "@app/logger"
   import "@app/policies"
   import {restoreSession} from "@app/session"
+  import {signerRequests} from "@app/signer"
   import {wallet} from "@app/lightning"
   import {kv, ss, storage} from "@app/storage"
   import {device} from "@app/device"
@@ -235,6 +236,28 @@
       }),
     )
 
+    // Listen for signer errors, report to user via toast
+    unsubscribers.push(
+      throttled(10_000, signerRequests).subscribe($requests => {
+        if ($toast) return
+
+        const longCutoff = Date.now() - 30_000
+        const shortCutoff = Date.now() - 10_000
+        const pending = $requests.filter(r => !r.finishedAt && r.startedAt < longCutoff)
+        const completed = $requests.filter(r => r.finishedAt && r.finishedAt > shortCutoff)
+        const showPendingError = pending.length > 10
+        const showCompletedError = completed.length > 5 && completed.filter(r => r.ok).length === 0
+
+        if (showPendingError || showCompletedError) {
+          pushToast({
+            theme: "error",
+            timeout: 60_000,
+            message: "Your signer isn't responding.",
+          })
+        }
+      }),
+    )
+
     // Sync theme and font size
     unsubscribers.push(
       activeTheme.subscribe($activeTheme => {