feat(flowpilot): add always-visible message bar, remove hidden free text escape hatch

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/flowpilot/FlowPilotSession.tsx

@@ -11,6 +11,7 @@ import type {
 import { ConfidenceIndicator } from './ConfidenceIndicator'
 import { FlowPilotStepCard } from './FlowPilotStepCard'
 import { FlowPilotActionBar } from './FlowPilotActionBar'
+import { FlowPilotMessageBar } from './FlowPilotMessageBar'
 import { SessionDocView } from './SessionDocView'
 import { SessionTicketCard } from './SessionTicketCard'
 import { SimilarSessions } from './SimilarSessions'
@@ -300,6 +301,15 @@ export function FlowPilotSession({
         </div>
       </div>
 
+      {/* Message bar */}
+      {session.status === 'active' && (
+        <FlowPilotMessageBar
+          onRespond={onRespond}
+          isProcessing={isProcessing}
+          disabled={currentStep?.allow_free_text === false}
+        />
+      )}
+
       {/* Action bar */}
       {session.status === 'active' && (
         <FlowPilotActionBar