Featured rotation -> day-slot booking: 10 slots/day, pick your start day, live occupancy

- Per-day occupancy shown in composer (Today 1/10, Tomorrow 2/10, …), full days unpickable
- Book a specific start day + duration; every covered day must have an open slot
- Slot cap turns dilution disclosure into a hard ceiling; featured skips frame-check (new-tab)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

public/assets/site.css

@@ -259,6 +259,15 @@ textarea{resize:vertical;font:inherit}
   #boBurger{display:block}
   .bo-content{padding:18px}
 }
+/* ── featured day-slot picker ── */
+.feat-days{display:flex;gap:8px;flex-wrap:wrap}
+.feat-day{flex:0 0 auto;min-width:82px;padding:8px 10px;border:1px solid var(--line-strong);border-radius:10px;
+  background:var(--panel);cursor:pointer;text-align:center}
+.feat-day.on{border-color:var(--mint);box-shadow:0 0 0 1px var(--mint)}
+.feat-day.full{opacity:.45;cursor:not-allowed}
+.feat-day .fd-day{font-weight:700;font-size:12px}
+.feat-day .fd-occ{font-family:var(--mono);font-size:11px;color:var(--muted)}
+.feat-day.open2 .fd-occ{color:var(--mint)}
 /* ── featured rotation strip ── */
 .feat-strip{display:flex;flex-direction:column;gap:8px;margin-top:10px}
 .feat-strip a{display:flex;justify-content:space-between;gap:10px;padding:11px 14px;border-radius:10px;