feat: in-memory inquiry flow — send from card, pipeline, and detail

New inquiryStore (Zustand) holds sent inquiries for the session.
InquiryQuickDialog reads from the store (no props), renders wherever needed.
Sent inquiries appear immediately at the top of the Anfragen page.

Entry points:
- Match cards: "Anfrage" button on every card in the results feed
- MatchDetail: primary action in NextActionsPanel
- Pipeline: chat icon on every DraggableCard

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

src/pages/demand/Anfragen.tsx

@@ -6,6 +6,7 @@ import {
 } from '@mui/material'
 import { Search, Send, Paperclip, ArrowLeft, Bot, Building2, Kanban } from 'lucide-react'
 import { mockInquiries } from '../../mock-data/inquiries'
+import { useInquiryStore } from '../../stores/inquiryStore'
 import { usePipelineItems, useMoveStage } from '../../hooks/usePipeline'
 import { useToastStore } from '../../stores/toastStore'
 import type { InquiryMessage } from '../../domain/inquiry'
@@ -34,7 +35,10 @@ export default function Anfragen() {
 
   const preselectedId = searchParams.get('inquiry')
 
+  const storeInquiries = useInquiryStore(s => s.sentInquiries)
   const [inquiries, setInquiries] = useState(mockInquiries)
+  const allInquiries = [...storeInquiries, ...inquiries]
+
   const [selectedId, setSelectedId] = useState<string | null>(
     preselectedId ?? mockInquiries[0]?.id ?? null
   )
@@ -45,7 +49,7 @@ export default function Anfragen() {
   const [kiAlert, setKiAlert] = useState<{ title: string; stage: string } | null>(null)
   const threadRef = useRef<HTMLDivElement>(null)
 
-  const filtered = inquiries.filter(inq => {
+  const filtered = allInquiries.filter(inq => {
     const q = search.toLowerCase()
     const matchesSearch = !q ||
       inq.tenantName.toLowerCase().includes(q) ||
@@ -55,8 +59,8 @@ export default function Anfragen() {
     return matchesSearch && matchesStatus
   })
 
-  const selected = inquiries.find(i => i.id === selectedId) ?? null
-  const totalUnread = inquiries.reduce((sum, i) => sum + i.unreadCount, 0)
+  const selected = allInquiries.find(i => i.id === selectedId) ?? null
+  const totalUnread = allInquiries.reduce((sum, i) => sum + i.unreadCount, 0)
 
   // Pipeline link for currently selected inquiry
   const linkedPipelineItem = selected?.propertyId