feat: rebrand AgendaPro -> AgendaMax + calendar fixes + current-week demo seed

- Rebrand all user-facing text to AgendaMax
- Fix sidebar scrolling: card container no longer overflows html (flex h-full min-h-0)
- Fix calendar toolbar hover: active buttons keep readable contrast
- Sticky calendar toolbar (month/week/day always visible on scroll)
- Seed guarantees 2-4 appointments per day for current week (Mon-Sat)

src/index.css

@@ -66,6 +66,12 @@ body {
   color: #0f172a;
 }
 .fc .fc-toolbar.fc-header-toolbar {
+  position: sticky;
+  top: 0;
+  z-index: 10;
+  background: #ffffff;
+  padding: 0.4rem 0.6rem;
+  margin: -0.4rem -0.6rem 0;
   flex-wrap: wrap;
   gap: 0.5rem 0.75rem;
 }
@@ -101,11 +107,18 @@ body {
   text-transform: capitalize;
   box-shadow: none !important;
 }
-.fc .fc-button:not(:disabled):hover {
+.fc .fc-button:not(:disabled):not(.fc-button-active):hover {
   background: #f3f4f6;
 }
 .fc .fc-button-primary:not(:disabled).fc-button-active {
   color: #ffffff;
+  background: var(--fc-button-active-bg-color, #3b66ff);
+  border-color: var(--fc-button-active-border-color, #3b66ff);
+}
+.fc .fc-button-primary:not(:disabled).fc-button-active:hover {
+  background: #2447f5;
+  border-color: #2447f5;
+  color: #ffffff;
 }
 .fc .fc-button:disabled {
   opacity: 0.5;
@@ -136,6 +149,7 @@ body {
   font-weight: 600 !important;
   cursor: pointer;
   transition: transform 0.12s, box-shadow 0.12s;
+  overflow: hidden;
 }
 .fc-event:hover {
   transform: translateY(-1px);
@@ -149,6 +163,16 @@ body {
 }
 .fc-timegrid-event {
   overflow: hidden;
+  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.35);
+}
+.fc-timegrid-event-harness {
+  margin-right: 2px !important;
+}
+/* When slotEventOverlap is false, FullCalendar puts a small gap between
+   side-by-side events; tighten it a touch so each event gets more readable
+   width without bleeding into its neighbour. */
+.fc .fc-timegrid-col-events {
+  column-gap: 2px;
 }
 
 /* List view (great on mobile) */