frontend: clinical UI fixes + chat/composer polish

- chat composer: attach works with text (sr-only file input); lighter
  bordered input box
- messages: defer "+" menu actions past close so file/appointment pickers fire
- tasks: top-level New task button
- chat: condensed appointment card with "View in calendar" deep-link;
  appointments page auto-opens the month calendar from ?calendar=&date=
- lab: work-queue rows expand to show task detail + complete
- inventory: clickable item detail dialog
- pharmacy: Dispense action records a dispense + "Recently dispensed" feed;
  expiring badge uses endDate and only flags <=2 days left
- prescriptions: keyboard nav in patient search, inventory-backed medication
  combobox (free-text fallback), optional start/end dates; thread dates through
- sidebar: whole nav scrolls as one
- i18n keys for all new strings

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

frontend/components/ui/sidebar.tsx

@@ -415,7 +415,10 @@ export function SidebarContent({
     <ScrollArea className="min-h-0 flex-1" fill scrollFade>
       <div
         className={cn(
-          "flex h-full flex-col gap-2 group-data-[collapsible=icon]:overflow-hidden",
+          // `min-h-full` (not `h-full`) so the content can grow taller than the
+          // viewport and the surrounding ScrollArea actually scrolls, rather than
+          // pinning to the viewport height and clipping a tall nav.
+          "flex min-h-full flex-col gap-2 group-data-[collapsible=icon]:overflow-hidden",
           className,
         )}
         data-sidebar="content"