feat: harden campaign delivery and editing

webui/src/features/campaigns/review/BuiltMessagePreview.tsx

@@ -112,10 +112,10 @@ export default function BuiltMessagePreview({
         <Button
           variant="primary"
           disabled={singleMessageSendBusy || Boolean(singleSendDisabledReason)}
-          title={singleSendDisabledReason || "Send only this built message"}
+          title={singleSendDisabledReason || "Test, send, or resend only this built message"}
           onClick={() => onSendSingle(index)}
         >
-          {singleMessageSendBusy ? "Sending..." : "Send this message..."}
+          {singleMessageSendBusy ? "Sending..." : "Message actions..."}
         </Button>
       }
       onClose={onClose}
@@ -139,28 +139,15 @@ function singleMessageSendDisabledReason(
     return `This message is ${humanize(validationStatus)}.`;
   }
   const sendStatus = String(row.send_status ?? "not_queued");
-  const queueStatus = String(row.queue_status ?? "draft");
-  if (["smtp_accepted", "sent"].includes(sendStatus)) {
-    return "This message was already accepted by SMTP.";
-  }
   if (["claimed", "sending", "outcome_unknown"].includes(sendStatus)) {
     return `This message is in delivery state ${humanize(sendStatus)}.`;
   }
-  if (["failed_temporary", "failed_permanent"].includes(sendStatus)) {
-    return "Use the explicit retry action for failed messages.";
-  }
-  if (sendStatus === "queued" && queueStatus === "queued") return "";
-  if (
-    ["not_queued", "cancelled"].includes(sendStatus) &&
-    ["draft", "cancelled"].includes(queueStatus)
-  ) {
-    return "";
-  }
-  return `This message cannot be sent from queue ${humanize(queueStatus)} / send ${humanize(sendStatus)}.`;
+  return "";
 }
 
 function builtMessageMetaItems(row: Record<string, unknown>) {
   const recipients = asRecord(row.resolved_recipients);
+  const postboxTargets = asArray(row.resolved_postbox_targets).map(asRecord);
   return [
     {
       label: "i18n:govoplan-campaign.from.3f66052a",
@@ -182,6 +169,23 @@ function builtMessageMetaItems(row: Record<string, unknown>) {
       label: "i18n:govoplan-campaign.validation.dd74d182",
       value: String(row.validation_status ?? "—")
     },
+    {
+      label: "Frozen Postbox targets",
+      value: postboxTargets.length
+        ? postboxTargets
+            .map((target) => {
+              const label = String(
+                target.name ?? target.address ?? target.postbox_id ?? "Postbox"
+              );
+              const address = String(target.address ?? "");
+              const context = target.context_key
+                ? ` [${String(target.context_key)}]`
+                : "";
+              return `${label}${address && address !== label ? ` <${address}>` : ""}${context}`;
+            })
+            .join(", ")
+        : null
+    },
     {
       label: "i18n:govoplan-campaign.mime_size.c8b9d519",
       value: row.eml_size_bytes ? `${String(row.eml_size_bytes)} bytes` : "—"