feat(threat-actors): Generate Campaign button on actor detail page

Adds a Generate Campaign button (purple, visible to leads/admin) in the
threat actor header. Opens a modal with:
- Actor name shown as context
- Start date picker (required — validated: must be today or future)
- Warning message showing when tests will be queued
- Error display for API failures
- On success: redirects to the new campaign detail page

Start date is mandatory here (unlike the CampaignsPage flow where it
is optional) to enforce scheduling discipline when generating from actors.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/ThreatActorDetailPage.tsx

@@ -1,7 +1,8 @@
+import { useState } from "react";
 import { useParams, useNavigate } from "react-router-dom";
 import MarkdownText from "../components/MarkdownText";
 import MotivationBadge from "../components/MotivationBadge";
-import { useQuery } from "@tanstack/react-query";
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
 import {
   Loader2,
   AlertCircle,
@@ -17,6 +18,9 @@ import {
   Clock,
   Crosshair,
   FlaskConical,
+  Swords,
+  X,
+  Calendar,
 } from "lucide-react";
 import {
   getThreatActor,
@@ -25,6 +29,8 @@ import {
   type ThreatActorTechnique,
   type GapItem,
 } from "../api/threat-actors";
+import { generateCampaignFromThreatActor } from "../api/campaigns";
+import { useAuth } from "../context/AuthContext";
 
 // ── MITRE ATT&CK Tactics in kill chain order ──────────────────────
 const TACTICS_ORDER = [
@@ -97,6 +103,44 @@ function statusIcon(status: string | null) {
 export default function ThreatActorDetailPage() {
   const { actorId } = useParams();
   const navigate = useNavigate();
+  const queryClient = useQueryClient();
+  const { user } = useAuth();
+
+  const canGenerate =
+    user?.role === "admin" || user?.role === "red_lead" || user?.role === "blue_lead";
+
+  // ── Campaign generation modal state ─────────────────────────────
+  const [showCampaignModal, setShowCampaignModal] = useState(false);
+  const [campaignStartDate, setCampaignStartDate] = useState("");
+  const [dateError, setDateError] = useState("");
+
+  const generateMutation = useMutation({
+    mutationFn: () =>
+      generateCampaignFromThreatActor(actorId!, { start_date: campaignStartDate }),
+    onSuccess: (campaign) => {
+      queryClient.invalidateQueries({ queryKey: ["campaigns"] });
+      setShowCampaignModal(false);
+      setCampaignStartDate("");
+      setDateError("");
+      navigate(`/campaigns/${campaign.id}`);
+    },
+  });
+
+  const handleGenerateSubmit = () => {
+    if (!campaignStartDate) {
+      setDateError("Start date is required");
+      return;
+    }
+    const selected = new Date(campaignStartDate + "T00:00:00");
+    const today = new Date();
+    today.setHours(0, 0, 0, 0);
+    if (selected < today) {
+      setDateError("Start date must be today or in the future");
+      return;
+    }
+    setDateError("");
+    generateMutation.mutate();
+  };
 
   // ── Queries ─────────────────────────────────────────────────────
   const { data: actor, isLoading, error } = useQuery({
@@ -196,7 +240,22 @@ export default function ThreatActorDetailPage() {
             )}
           </div>
 
-          {/* MITRE link */}
+          {/* Action buttons */}
+          <div className="flex items-center gap-2">
+            {canGenerate && (
+              <button
+                onClick={() => {
+                  setShowCampaignModal(true);
+                  setCampaignStartDate("");
+                  setDateError("");
+                  generateMutation.reset();
+                }}
+                className="flex items-center gap-1.5 rounded-lg border border-purple-500/40 bg-purple-900/30 px-3 py-2 text-xs font-medium text-purple-300 hover:bg-purple-900/50 transition-colors"
+              >
+                <Swords className="h-3.5 w-3.5" />
+                Generate Campaign
+              </button>
+            )}
             {actor.mitre_url && (
               <a
                 href={actor.mitre_url}
@@ -209,6 +268,7 @@ export default function ThreatActorDetailPage() {
               </a>
             )}
           </div>
+        </div>
 
         {/* Meta badges */}
         <div className="mt-4 flex flex-wrap items-center gap-3">
@@ -563,6 +623,108 @@ export default function ThreatActorDetailPage() {
           </ul>
         </div>
       )}
+      {/* ── Generate Campaign Modal ─────────────────────────────────── */}
+      {showCampaignModal && (
+        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/70 backdrop-blur-sm">
+          <div className="mx-4 w-full max-w-md rounded-xl border border-purple-500/30 bg-gray-900 shadow-2xl">
+            {/* Header */}
+            <div className="flex items-center justify-between border-b border-gray-800 px-6 py-4">
+              <div className="flex items-center gap-2">
+                <Swords className="h-5 w-5 text-purple-400" />
+                <h3 className="text-lg font-semibold text-white">Generate Campaign</h3>
+              </div>
+              <button
+                onClick={() => setShowCampaignModal(false)}
+                className="rounded p-1 text-gray-400 hover:bg-gray-800 hover:text-white transition-colors"
+              >
+                <X className="h-5 w-5" />
+              </button>
+            </div>
+
+            <div className="px-6 py-5 space-y-5">
+              {/* Actor info */}
+              <div className="flex items-center gap-3 rounded-lg border border-purple-500/20 bg-purple-900/10 px-4 py-3">
+                <Crosshair className="h-4 w-4 shrink-0 text-purple-400" />
+                <div>
+                  <p className="text-xs text-gray-500">Threat actor</p>
+                  <p className="text-sm font-medium text-white">{actor.name}</p>
+                </div>
+              </div>
+
+              {/* What this does */}
+              <p className="text-xs text-gray-400 leading-relaxed">
+                A campaign will be auto-generated covering all uncovered techniques for this actor,
+                ordered by kill chain phase. Tests will be hidden from the team queue until the start date.
+              </p>
+
+              {/* Start date — required */}
+              <div>
+                <label className="mb-1.5 flex items-center gap-1.5 text-sm font-medium text-gray-300">
+                  <Calendar className="h-4 w-4 text-purple-400" />
+                  Start date
+                  <span className="text-red-400">*</span>
+                </label>
+                <input
+                  type="date"
+                  value={campaignStartDate}
+                  min={new Date().toISOString().split("T")[0]}
+                  onChange={(e) => {
+                    setCampaignStartDate(e.target.value);
+                    if (dateError) setDateError("");
+                  }}
+                  className={`w-full rounded-lg border px-3 py-2 text-sm text-gray-200 bg-gray-800 focus:outline-none focus:border-purple-500 transition-colors [color-scheme:dark] ${
+                    dateError ? "border-red-500" : "border-gray-700"
+                  }`}
+                />
+                {dateError && (
+                  <p className="mt-1.5 flex items-center gap-1.5 text-xs text-red-400">
+                    <AlertCircle className="h-3.5 w-3.5 shrink-0" />
+                    {dateError}
+                  </p>
+                )}
+                {campaignStartDate && !dateError && (
+                  <p className="mt-1.5 text-xs text-amber-400">
+                    ⏰ Tests will be queued for the team on{" "}
+                    {new Date(campaignStartDate + "T00:00:00").toLocaleDateString("en-GB", {
+                      day: "numeric", month: "long", year: "numeric",
+                    })}
+                  </p>
+                )}
+              </div>
+
+              {/* API error */}
+              {generateMutation.isError && (
+                <div className="flex items-start gap-2 rounded-lg border border-red-500/30 bg-red-900/20 px-3 py-2.5 text-xs text-red-400">
+                  <AlertCircle className="h-3.5 w-3.5 mt-0.5 shrink-0" />
+                  {(generateMutation.error as Error)?.message || "Failed to generate campaign"}
+                </div>
+              )}
+            </div>
+
+            {/* Footer */}
+            <div className="flex justify-end gap-3 border-t border-gray-800 px-6 py-4">
+              <button
+                onClick={() => setShowCampaignModal(false)}
+                className="rounded-lg border border-gray-700 px-4 py-2 text-sm text-gray-400 hover:bg-gray-800 transition-colors"
+              >
+                Cancel
+              </button>
+              <button
+                onClick={handleGenerateSubmit}
+                disabled={generateMutation.isPending}
+                className="flex items-center gap-1.5 rounded-lg bg-purple-700 px-5 py-2 text-sm font-medium text-white hover:bg-purple-600 disabled:opacity-50 transition-colors"
+              >
+                {generateMutation.isPending ? (
+                  <Loader2 className="h-4 w-4 animate-spin" />
+                ) : (
+                  <Swords className="h-4 w-4" />
+                )}
+                Generate Campaign
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   );
 }