feat: enhance CurrentDutyView with new functionality and improved tests

- Added a button to open the calendar in the no-duty view, triggering the onBack function.
- Implemented tests for the new button functionality and error handling in the CurrentDutyView component.
- Updated localization messages to include the new "Open calendar" label in both English and Russian.
- Refactored layout and styling for better user experience and accessibility.

webapp-next/src/components/current-duty/CurrentDutyView.tsx

@@ -166,15 +166,14 @@ export function CurrentDutyView({ onBack, openedFromPin = false }: CurrentDutyVi
         aria-label={t("loading")}
       >
         <Card className="current-duty-card w-full max-w-[var(--max-width-app)] border-t-4 border-t-duty">
-          <CardHeader>
+          <CardContent className="flex flex-col gap-4 pt-6">
             <div className="flex items-center gap-2">
-              <Skeleton className="size-2.5 shrink-0 rounded-full" />
-              <Skeleton className="h-5 w-32" />
+              <Skeleton className="size-2 shrink-0 rounded-full" />
+              <Skeleton className="h-5 w-24 rounded-full" />
             </div>
-          </CardHeader>
-          <CardContent className="flex flex-col gap-4 pt-1">
             <div className="flex flex-col gap-2">
-              <Skeleton className="h-6 w-48" />
+              <Skeleton className="h-7 w-48" />
+              <Skeleton className="h-4 w-full max-w-[200px]" />
               <Skeleton className="h-4 w-full max-w-[280px]" />
             </div>
             <Skeleton className="h-14 w-full rounded-lg" />
@@ -246,10 +245,17 @@ export function CurrentDutyView({ onBack, openedFromPin = false }: CurrentDutyVi
               {t("current_duty.no_duty")}
             </p>
           </CardContent>
-          <CardFooter>
+          <CardFooter className="flex flex-col gap-2 sm:flex-row sm:justify-end">
             <Button onClick={handlePrimaryAction} aria-label={primaryButtonAriaLabel}>
               {primaryButtonLabel}
             </Button>
+            <Button
+              variant="outline"
+              onClick={onBack}
+              aria-label={t("current_duty.open_calendar")}
+            >
+              {t("current_duty.open_calendar")}
+            </Button>
           </CardFooter>
         </Card>
       </div>
@@ -287,41 +293,45 @@ export function CurrentDutyView({ onBack, openedFromPin = false }: CurrentDutyVi
         role="article"
         aria-labelledby="current-duty-title"
       >
-        <CardHeader>
-          <CardTitle
-            id="current-duty-title"
-            className="flex items-center gap-2"
-          >
-            <span
-              className="inline-block size-2.5 shrink-0 rounded-full bg-duty animate-pulse motion-reduce:animate-none"
-              aria-hidden
-            />
-            {t("current_duty.title")}
-          </CardTitle>
+        <CardHeader className="sr-only">
+          <CardTitle id="current-duty-title">{t("current_duty.title")}</CardTitle>
         </CardHeader>
-        <CardContent className="flex flex-col gap-4 pt-1">
+        <CardContent className="flex flex-col gap-4 pt-6">
+          <span
+            className="inline-flex w-fit items-center gap-2 rounded-full bg-duty/15 px-2.5 py-1 text-xs font-medium text-foreground"
+            aria-hidden
+          >
+            <span className="size-2 shrink-0 rounded-full bg-duty animate-pulse motion-reduce:animate-none" />
+            {t("duty.now_on_duty")}
+          </span>
           <section className="flex flex-col gap-2" aria-label={t("current_duty.shift")}>
             <p
-              className="text-lg font-semibold text-foreground leading-tight"
+              className="text-xl font-bold text-foreground leading-tight"
               id="current-duty-name"
             >
               {duty.full_name}
             </p>
             <p className="text-sm text-muted-foreground break-words">
-              {shiftLabel} {shiftStr}
+              {shiftLabel}
+            </p>
+            <p className="text-sm text-muted-foreground break-words">
+              {shiftStr}
             </p>
           </section>
           <div
-            className="rounded-lg bg-duty/10 px-3 py-2.5 flex flex-col gap-0.5"
+            className="rounded-lg bg-duty/10 px-3 py-2.5 flex flex-col gap-1"
             aria-live="polite"
             aria-atomic="true"
           >
             <span className="text-xs text-muted-foreground">
               {t("current_duty.remaining_label")}
             </span>
-            <span className="text-base font-semibold text-foreground tabular-nums">
+            <span className="text-xl font-semibold text-foreground tabular-nums">
               {remainingValueStr}
             </span>
+            <span className="text-xs text-muted-foreground">
+              {t("current_duty.ends_at", { time: formatHHMM(duty.end_at) })}
+            </span>
           </div>
           <section className="flex flex-col gap-2 border-t border-border/50 pt-4" aria-label={t("contact.label")}>
           {hasContacts ? (