refactor: remove Schattenmarkt from all user-visible UI strings

- Pipeline.tsx: FUTURE_AVAILABILITY label → 'Future Availability'
- ReminderTypeBadge: SCHATTENMARKT_RELEASE label → 'Pre-Market'
- ReminderFilterBar: SCHATTENMARKT_RELEASE label → 'Pre-Market'
- ReminderKpiBar: 'Schattenmarkt-Risiko' → 'Pre-Market Risiko'
- ReminderDetailDrawer: section title + switch label → 'Pre-Market'
- mock-data/matches: explainabilitySummary → 'Pre-Market freigegeben'
- mock-data/reminders: notes → 'Pre-Market Freigabe'

Internal identifiers (schattenmarktRelease field, useSchattenmarktSignals hook,
signal ID prefix schattenmarkt-*) are unchanged — renaming them touches too many
call sites for no user-visible gain.

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

src/components/supply/ReminderDetailDrawer.tsx

@@ -226,9 +226,9 @@ export function ReminderDetailDrawer() {
 
             <Divider />
 
-            {/* 5. Schattenmarkt */}
+            {/* 5. Pre-Market */}
             <Box>
-              <SectionTitle icon={<Eye size={15} color="#64748b" />}>Schattenmarkt-Risiko</SectionTitle>
+              <SectionTitle icon={<Eye size={15} color="#64748b" />}>Pre-Market Risiko</SectionTitle>
               <Box className="flex flex-col gap-2">
                 <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                   <Box
@@ -248,7 +248,7 @@ export function ReminderDetailDrawer() {
                     control={<Switch checked={reminder.schattenmarktEnabled} size="small" readOnly />}
                     label={
                       <Typography variant="caption">
-                        Schattenmarkt aktiviert
+                        Pre-Market aktiviert
                       </Typography>
                     }
                   />