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/tasks/tasks-view.tsx

@@ -389,11 +389,17 @@ export function TasksView() {
 
   return (
     <div className="flex h-full w-full flex-col gap-6 px-6 py-8">
-      <div className="flex flex-col gap-1">
-        <h1 className="font-semibold text-2xl tracking-tight">
-          {t("tasks.title")}
-        </h1>
-        <p className="text-muted-foreground text-sm">{t("tasks.subtitle")}</p>
+      <div className="flex flex-col gap-4 sm:flex-row sm:items-start sm:justify-between">
+        <div className="flex flex-col gap-1">
+          <h1 className="font-semibold text-2xl tracking-tight">
+            {t("tasks.title")}
+          </h1>
+          <p className="text-muted-foreground text-sm">{t("tasks.subtitle")}</p>
+        </div>
+        <Button onClick={() => openAdd("todo")} type="button">
+          <Plus className="size-4" />
+          {t("tasks.board.newTask")}
+        </Button>
       </div>
 
       <div className="grid min-h-0 flex-1 grid-cols-1 gap-4 md:grid-cols-3">