Add Calendar dialog, Prescriptions & Messages pages, note delete confirm

- Appointments: a Calendar button next to Add opens a month-grid dialog
  (reuses the Calendar primitive + shared ScheduleList); the schedule day is
  marked and selecting it lists that day's appointments.
- Patients sub-nav: new Prescriptions page (mock list + KPIs) with a compact
  "New prescription" dialog reusing the patient quick-search pattern.
- Notes: deleting a note now goes through a reusable ConfirmDialog instead of
  deleting immediately.
- New top-level Messages page: two-pane email-style inbox (list + reading pane
  with mock reply composer), mirroring the Notes layout.
- Sidebar logo bumped from size-9 to size-10.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/components/sidebar-02/app-sidebar.tsx

@@ -84,11 +84,11 @@ export function DashboardSidebar() {
               >
                 <Image
                   alt="temetro"
-                  className="size-9 shrink-0"
-                  height={36}
+                  className="size-10 shrink-0"
+                  height={40}
                   priority
                   src="/temetro-logo.png"
-                  width={36}
+                  width={40}
                 />
               </a>
             }