fix: premjesti kalendar widget u Layout, popravi PDF toast i Servisi danas

- TaskCalendarPortal u Layout.astro (van AnimatedPage transforma) pa fixed
  pozicija uvijek prati viewport rub bez probijanja sadržaja
- Kalendar widgeta panel koristi clipping wrapper (overflow:hidden + animirana
  width) umjesto translate3d — potpuno skriva sjenu i border kad je zatvoren
- Serviser vidi samo svoje taskove, supervisor vidi sve; neprijavljeni korisnik
  ne vidi widget (return null)
- FleetDashboardShell sluša calendar:open-task event i otvara TaskServiceRecordsModal
- Servisi danas broji Taskove (scheduled_date=danas, status aktivan/servis)
  umjesto Servisnih zapisa
- downloadGeneratedPdfByUrl hvata grešku i prikazuje Toast (npr. PDF nije
  dostupan ili je istekao)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/src/components/layout/TaskCalendarPortal.jsx

@@ -0,0 +1,50 @@
+import { useMemo } from 'preact/hooks';
+import { useStore } from '@nanostores/preact';
+import { $tasks } from '../../stores/taskStore';
+import { $user } from '../../stores/authStore';
+import TaskCalendarWidget from '../dashboard/TaskCalendarWidget';
+
+/**
+ * Mountan u Layout.astro (van AnimatedPage transforma) pa fixed pozicija
+ * uvijek ostaje uz viewport rub.
+ *
+ * Filtriranje taskova po ulozi:
+ * - Serviser → samo taskovi dodijeljeni njemu
+ * - Supervisor (nije serviser) → svi taskovi
+ *
+ * Kad korisnik klikne task u kalendaru, šaljemo custom event koji
+ * FleetDashboardShell sluša i otvara TaskServiceRecordsModal.
+ */
+export default function TaskCalendarPortal() {
+    const allTasks = useStore($tasks);
+    const user = useStore($user);
+
+    const isServiser = Boolean(user?.is_serviser);
+    const isTeamMember = Boolean(user?.is_team_member);
+    const isSupervisorNotServiser = isTeamMember && !isServiser;
+
+    const tasks = useMemo(() => {
+        if (!user?.id) return [];
+        // Supervisor vidi sve; serviser vidi samo svoje
+        if (isSupervisorNotServiser) return allTasks;
+        return allTasks.filter(
+            (t) => String(t.assigned_to || '') === String(user.id)
+        );
+    }, [allTasks, user, isSupervisorNotServiser]);
+
+    // Ne renderiramo ništa ako korisnik nije prijavljen
+    if (!user?.id) return null;
+
+    function handleTaskClick(task) {
+        window.dispatchEvent(
+            new CustomEvent('calendar:open-task', { detail: { task } })
+        );
+    }
+
+    return (
+        <TaskCalendarWidget
+            tasks={tasks}
+            onTaskClick={handleTaskClick}
+        />
+    );
+}