fix: cockpit/flowpilot bugs and redesign view toggle placement

- Fix return type annotation on unified_chat_service.send_chat_message (6→7 tuple)
- Fix stale closure in CockpitPage handleStepComplete auto-advance logic
- Fix IncidentHeader copy link hardcoding /assistant/ path (now uses current URL)
- Wire psaTicketId from session data through to CockpitPage incident header
- Fix FlowPilotAsks showing only first question — add chevron navigation for all
- Redesign ViewToggle: add icons (MessageSquare/LayoutDashboard) and subtitles
- Move view toggle from chatbar toolbar to standalone row above input on dashboard
- Standardize toggle placement across dashboard, FlowPilot, and Cockpit pages

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

frontend/src/components/assistant/IncidentHeader.tsx

@@ -7,7 +7,6 @@ import type { TriageMeta } from '@/types/ai-session'
 interface IncidentHeaderProps {
   triageMeta: TriageMeta
   psaTicketId: string | null
-  sessionId: string
   onFieldSave: (field: keyof TriageMeta, value: string) => void
   onResolve: () => void
   onPause?: () => void
@@ -97,7 +96,7 @@ function HeaderField({ label, value, placeholder, onSave, isHypothesis }: Header
   )
 }
 
-function OverflowMenu({ onPause, onClose, sessionId }: { onPause?: () => void; onClose?: () => void; sessionId: string }) {
+function OverflowMenu({ onPause, onClose }: { onPause?: () => void; onClose?: () => void }) {
   const [open, setOpen] = useState(false)
   const menuRef = useRef<HTMLDivElement>(null)
 
@@ -118,7 +117,7 @@ function OverflowMenu({ onPause, onClose, sessionId }: { onPause?: () => void; o
   }, [open])
 
   const handleCopyLink = () => {
-    navigator.clipboard.writeText(`${window.location.origin}/assistant/${sessionId}`)
+    navigator.clipboard.writeText(`${window.location.origin}${window.location.pathname}`)
     toast.success('Session link copied')
     setOpen(false)
   }
@@ -167,7 +166,6 @@ function OverflowMenu({ onPause, onClose, sessionId }: { onPause?: () => void; o
 export function IncidentHeader({
   triageMeta,
   psaTicketId,
-  sessionId,
   onFieldSave,
   onResolve,
   onPause,
@@ -217,7 +215,7 @@ export function IncidentHeader({
         >
           Resolve
         </button>
-        <OverflowMenu onPause={onPause} onClose={onClose} sessionId={sessionId} />
+        <OverflowMenu onPause={onPause} onClose={onClose} />
       </div>
     </div>
   )