Add descriptive error messages across all API routes and toast notifications on client pages

- 86 catch blocks in 49 API route files now return the actual error message via error.message
- 14 campaign/lead/config catch blocks that lacked console.error now log errors
- 17 client pages/components now show toast.error notifications on API failures
- Silent .catch(() => {}) and finally-only try blocks now surface errors to users

src/app/(dashboard)/campaigns/[id]/page.tsx

@@ -12,6 +12,7 @@ import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs"
 import {
   ArrowLeft, Plus, Trash2, Send, Play, Pause, Users, Mail, Clock,
 } from "lucide-react"
+import { toast } from "sonner"
 
 export default function CampaignDetailPage({ params }: { params: Promise<{ id: string }> }) {
   const { id } = use(params)
@@ -29,7 +30,7 @@ export default function CampaignDetailPage({ params }: { params: Promise<{ id: s
     try {
       const res = await fetch(`/api/campaigns/${id}`)
       if (res.ok) setCampaign(await res.json())
-    } catch { /* ignore */ }
+    } catch (e) { console.error("Failed to load campaign", e); toast.error("Failed to load campaign") }
     setLoading(false)
   }
 
@@ -53,7 +54,7 @@ export default function CampaignDetailPage({ params }: { params: Promise<{ id: s
       })
       setNewStep({ subject: "", bodyText: "", delayDays: 3 })
       fetchCampaign()
-    } catch { /* ignore */ }
+    } catch (e) { console.error("Failed to add step", e); toast.error("Failed to add step") }
     setAddingStep(false)
   }
 
@@ -68,7 +69,7 @@ export default function CampaignDetailPage({ params }: { params: Promise<{ id: s
       setLeadSearch("")
       setSearchResults([])
       fetchCampaign()
-    } catch { /* ignore */ }
+    } catch (e) { console.error("Failed to subscribe leads", e); toast.error("Failed to subscribe leads") }
     setSubscribing(false)
   }
 
@@ -78,7 +79,7 @@ export default function CampaignDetailPage({ params }: { params: Promise<{ id: s
       const res = await fetch(`/api/campaigns/${id}/send`, { method: "POST" })
       const data = await res.json()
       if (data.sent > 0) fetchCampaign()
-    } catch { /* ignore */ }
+    } catch (e) { console.error("Failed to send campaign", e); toast.error("Failed to send campaign") }
     setSending(false)
   }