feat: F016 future availability workspace

2-panel workspace at /supply/future-availability: filterable signal list with FutureSignalCard (type/sensitivity/review badges + mandatory disclaimer) and collapsible detail panel with full evidence, review workflow (IN_REVIEW→APPROVED/REJECTED), shortlist action, and review task creation.

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

src/components/future-signals/SensitivityBadge.tsx

@@ -0,0 +1,19 @@
+import { Chip } from '@mui/material'
+
+const SENSITIVITY_META: Record<string, { label: string; color: string }> = {
+  PUBLIC:       { label: 'Öffentlich',    color: '#64748b' },
+  INTERNAL:     { label: 'Intern',        color: '#d97706' },
+  CONFIDENTIAL: { label: 'Vertraulich',   color: '#c0392b' },
+  RESTRICTED:   { label: 'Eingeschränkt', color: '#7c3aed' },
+}
+
+export function SensitivityBadge({ level }: { level: string }) {
+  const meta = SENSITIVITY_META[level] ?? { label: level, color: '#64748b' }
+  return (
+    <Chip
+      label={meta.label}
+      size="small"
+      sx={{ bgcolor: meta.color, color: 'white', fontWeight: 600, fontSize: 10 }}
+    />
+  )
+}