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)

package.json

@@ -15,7 +15,7 @@
     "seed": "tsx server/scripts/seed.ts",
     "test:e2e": "node e2e-test.mjs",
     "test:admin": "node admin-test.mjs",
-    "test:unit": "node --import tsx --test server/lib/scheduling.test.ts",
+    "test:unit": "node --import tsx --test server/lib/scheduling.test.ts server/lib/time.test.ts server/lib/metrics.test.ts",
     "test:booking": "node server/scripts/booking-e2e.mjs",
     "audit:visual": "node visual-audit.mjs"
   },