feat(pilot): EscalateInterceptDialog popover

Anchored above the Escalate button, captures fix outcome before the
engineer hands off the ticket. Defaults to 'didn't work' on Enter
(the common case). Alternatives: 'worked, escalating for another
reason' (preserves success) and 'never actually applied' (dismiss).

Task 11 will wire this to AssistantChatPage's Escalate handler.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/components/pilot/EscalateInterceptDialog.tsx

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+/**
+ * EscalateInterceptDialog — popover anchored above the Escalate button.
+ *
+ * Fires when the engineer clicks Escalate while a fix is in Verifying or
+ * Partial state. Captures the fix outcome before the escalation so the
+ * handoff narrative is honest for whoever picks up the ticket.
+ *
+ * Visual reference: docs/FlowAssist_Migration/mockups/07-verify-states.html
+ * (panel C).
+ */
+import { X, AlertCircle, Check } from 'lucide-react'
+import type { FixOutcome } from '@/api/sessionSuggestedFixes'
+
+export type InterceptChoice = FixOutcome | 'never_applied'
+
+export interface EscalateInterceptDialogProps {
+  fixTitle: string
+  onChoose: (choice: InterceptChoice) => void
+  onClose: () => void
+}
+
+export function EscalateInterceptDialog({
+  fixTitle,
+  onChoose,
+  onClose,
+}: EscalateInterceptDialogProps) {
+  return (
+    <>
+      <div
+        className="fixed inset-0 z-40"
+        onClick={onClose}
+        aria-hidden="true"
+      />
+      <div
+        role="dialog"
+        aria-label="Capture fix outcome before escalating"
+        className="absolute bottom-full mb-2 left-0 z-50 w-[340px] rounded-lg border border-white/15 bg-card p-3.5 shadow-[0_18px_40px_rgba(0,0,0,0.55)]"
+      >
+        <div className="font-heading font-semibold text-[13px] text-heading mb-1">
+          Before escalating — what happened with the fix?
+        </div>
+        <div className="text-[12px] text-muted-foreground leading-[1.5] mb-3">
+          &ldquo;{fixTitle}&rdquo; is still in the Verifying state. Tag its outcome so
+          the senior picking this up knows what&apos;s been tried.
+        </div>
+        <div className="flex flex-col gap-1.5">
+          <button
+            autoFocus
+            onClick={() => onChoose('applied_failed')}
+            className="flex items-center gap-2.5 px-3 py-2.5 rounded-lg border border-danger/30 bg-danger-dim text-[12.5px] text-primary hover:bg-danger-dim/80 hover:border-danger transition-colors text-left"
+          >
+            <X size={13} strokeWidth={2.5} className="text-danger" />
+            <span className="flex-1">The fix didn&apos;t work</span>
+            <span className="text-[10.5px] text-muted-foreground font-mono px-1.5 py-[2px] rounded bg-white/[0.05]">↵</span>
+          </button>
+          <button
+            onClick={() => onChoose('applied_success')}
+            className="flex items-center gap-2.5 px-3 py-2.5 rounded-lg border border-white/10 bg-elevated text-[12.5px] text-primary hover:bg-sidebar transition-colors text-left"
+          >
+            <Check size={13} strokeWidth={2} />
+            <span className="flex-1">It worked — escalating for another reason</span>
+          </button>
+          <button
+            onClick={() => onChoose('never_applied')}
+            className="flex items-center gap-2.5 px-3 py-2.5 rounded-lg border border-white/10 bg-elevated text-[12.5px] text-primary hover:bg-sidebar transition-colors text-left"
+          >
+            <AlertCircle size={13} strokeWidth={2} />
+            <span className="flex-1">Never actually applied it</span>
+          </button>
+        </div>
+      </div>
+    </>
+  )
+}
+
+export default EscalateInterceptDialog