feat(pitch): showcase mode — per-investor toggle hides financial/investor slides for customer demos

Adds is_showcase boolean to pitch_investors; when set, filters out financials,
the ask, cap table, assumptions, finanzplan, risks, and intro-presenter slides.
Slide navigation is fully dynamic — progress bar and counts update accordingly.

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

pitch-deck/app/pitch-admin/(authed)/investors/[id]/page.tsx

@@ -21,6 +21,7 @@ interface InvestorDetail {
     assigned_version_id: string | null
     version_name: string | null
     version_status: string | null
+    is_showcase: boolean
   }
   sessions: Array<{
     id: string
@@ -293,7 +294,7 @@ export default function InvestorDetailPage() {
       {/* Version assignment */}
       <section className="bg-white/[0.04] border border-white/[0.06] rounded-2xl p-5">
         <h2 className="text-sm font-semibold text-white mb-3">Pitch Version</h2>
-        <div className="flex items-center gap-3">
+        <div className="flex items-center gap-3 flex-wrap">
           <select
             value={inv.assigned_version_id || ''}
             onChange={async (e) => {
@@ -318,10 +319,35 @@ export default function InvestorDetailPage() {
           </select>
           <span className="text-xs text-white/40">
             {inv.assigned_version_id
-              ? `Investor sees version "${inv.version_name || ''}"`
-              : 'Investor sees default pitch data'}
+              ? `Sees version "${inv.version_name || ''}"`
+              : 'Sees default pitch data'}
           </span>
         </div>
+
+        {/* Showcase toggle */}
+        <div className="flex items-center justify-between mt-4 pt-4 border-t border-white/[0.06]">
+          <div>
+            <div className="text-sm text-white font-medium">Showcase mode</div>
+            <div className="text-xs text-white/40 mt-0.5">Hides financials, The Ask, and investor-only slides — for customer demos</div>
+          </div>
+          <button
+            onClick={async () => {
+              setBusy(true)
+              const res = await fetch(`/api/admin/investors/${id}`, {
+                method: 'PATCH',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({ is_showcase: !inv.is_showcase }),
+              })
+              setBusy(false)
+              if (res.ok) { flashToast(inv.is_showcase ? 'Switched to investor mode' : 'Switched to showcase mode'); load() }
+              else { flashToast('Update failed') }
+            }}
+            disabled={busy}
+            className={`relative w-11 h-6 rounded-full transition-colors duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-offset-black focus:ring-indigo-500 ${inv.is_showcase ? 'bg-indigo-500' : 'bg-white/10'}`}
+          >
+            <span className={`absolute top-0.5 left-0.5 w-5 h-5 bg-white rounded-full shadow transition-transform duration-200 ${inv.is_showcase ? 'translate-x-5' : 'translate-x-0'}`} />
+          </button>
+        </div>
       </section>
 
       {/* Audit log for this investor */}