feat: Future Availability Intelligence — rebrand & card redesign

Replaces "Schattenmarkt" branding with professional Future Availability
Intelligence throughout the UI. Two distinct card types: Pre-Market
(LEASE_EXPIRY + verified, green accent) and Market Signal (probabilistic,
blue accent). Professioneller Data-Header replaces dark purple gradient.
New detail panel sections: Erkannte Marktindikatoren, Strategische
Interpretation, Bestätigt/Nicht bestätigt. All 15 mock signals enriched
with concrete Swiss CRE market indicators and strategic interpretations.
Signal quality shown as 4-dot indicator (Hoch/Mittel/Niedrig).

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

src/pages/demand/Results.tsx

@@ -38,7 +38,7 @@ export default function Results() {
   const { currentUser } = useSessionStore()
   const [filterSource, setFilterSource] = useState<FilterSource>('ALL')
   const [sortBy, setSortBy] = useState<SortBy>('score')
-  const [showSchattenmarkt, setShowSchattenmarkt] = useState(true)
+  const [showFutureAvailability, setShowFutureAvailability] = useState(true)
   const [showOwnProperties, setShowOwnProperties] = useState(false)
   const [view, setView] = useState<'list' | 'grid'>(() =>
     (localStorage.getItem('view-results') as 'list' | 'grid') ?? 'list'
@@ -73,8 +73,8 @@ export default function Results() {
 
   const filtered = results.filter(r => {
     if (r.resultType === 'VERIFIED_PORTFOLIO') return showOwnProperties && currentUser?.role === 'PROPERTY_MANAGER'
-    // Schattenmarkt toggle is independent of the source filter
-    if (r.resultType === 'FUTURE_AVAILABILITY') return showSchattenmarkt
+    // Future Availability toggle is independent of the source filter
+    if (r.resultType === 'FUTURE_AVAILABILITY') return showFutureAvailability
     return filterSource === 'ALL' || r.resultType === filterSource
   })
 
@@ -176,8 +176,8 @@ export default function Results() {
           onFilterChange={setFilterSource}
           sortBy={sortBy}
           onSortChange={setSortBy}
-          showSchattenmarkt={showSchattenmarkt}
-          onShowSchattenmarktChange={setShowSchattenmarkt}
+          showFutureAvailability={showFutureAvailability}
+          onShowFutureAvailabilityChange={setShowFutureAvailability}
           showOwnProperties={showOwnProperties}
           onShowOwnPropertiesChange={setShowOwnProperties}
           isPropertyManager={currentUser?.role === 'PROPERTY_MANAGER'}
@@ -186,7 +186,7 @@ export default function Results() {
         {isLoading ? (
           <FeedSkeleton />
         ) : sorted.length === 0 ? (
-          <FeedEmptyState filtered={filterSource !== 'ALL' || !showSchattenmarkt || !showOwnProperties} />
+          <FeedEmptyState filtered={filterSource !== 'ALL' || !showFutureAvailability || !showOwnProperties} />
         ) : (
           <UnifiedResultFeed results={sorted} view={view} />
         )}