fix: schedule status labels, Open Day halls, unsaved data guards

Schedule:
- Status badges use admin config labels (not hardcoded text) everywhere
- DayCard: level badge moved next to status badge
- Single location: hide "Все студии" tab, auto-select the only hall
- Group view: hide per-card address when all share same location
- Filter tooltip z-index fixed (above dropdowns)
- Trainer bio: status labels from config, not raw keys

Open Day:
- Hall name + address shown in schedule grid headers
- Only one class card editable at a time (edit/create mutually exclusive)
- Bigger action buttons (cancel/delete) on class cards
- Create as empty draft (not pre-filled with published status)
- Fix discount threshold input (allow delete to empty)
- Skip auto-save during partial date input

Admin:
- SectionEditor: unsaved data guard (force-save before navigation)
- Open Day + Team: same navigation guards
- Contact: removed working hours field
- TimeRangeField: allow end time hour changes
- Schedule cards: visible borders, 90min default duration
- Trainer bio: RichTextarea for description
- Open Day: RichTextarea for description

src/app/admin/team/page.tsx

@@ -32,11 +32,12 @@ export default function TeamEditorPage() {
 
   // Auto-save section title with debounce (skip initial load)
   const titleChangeCount = useRef(0);
+  const pendingSaveRef = useRef(false);
   useEffect(() => {
     if (!titleLoadedRef.current) return;
     titleChangeCount.current++;
-    // Skip the first change (initial load setting the value)
     if (titleChangeCount.current <= 1) return;
+    pendingSaveRef.current = true;
     if (titleTimerRef.current) clearTimeout(titleTimerRef.current);
     titleTimerRef.current = setTimeout(async () => {
       const res = await adminFetch("/api/admin/sections/team", {
@@ -45,11 +46,40 @@ export default function TeamEditorPage() {
         body: JSON.stringify({ title: sectionTitle }),
       });
       setSaveStatus(res.ok ? "saved" : "error");
+      if (res.ok) pendingSaveRef.current = false;
       setTimeout(() => setSaveStatus("idle"), 2000);
     }, 800);
     return () => { if (titleTimerRef.current) clearTimeout(titleTimerRef.current); };
   }, [sectionTitle]);
 
+  // Warn before leaving with unsaved title
+  useEffect(() => {
+    function onBeforeUnload(e: BeforeUnloadEvent) {
+      if (pendingSaveRef.current) e.preventDefault();
+    }
+    function onLinkClick(e: MouseEvent) {
+      if (!pendingSaveRef.current) return;
+      const link = (e.target as HTMLElement).closest("a");
+      if (!link || link.target === "_blank") return;
+      const href = link.getAttribute("href");
+      if (!href || href.startsWith("#") || href.startsWith("/admin/team/")) return;
+      e.preventDefault();
+      e.stopPropagation();
+      if (titleTimerRef.current) clearTimeout(titleTimerRef.current);
+      adminFetch("/api/admin/sections/team", {
+        method: "PUT",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ title: sectionTitle }),
+      }).finally(() => { window.location.href = href; });
+    }
+    window.addEventListener("beforeunload", onBeforeUnload);
+    document.addEventListener("click", onLinkClick, true);
+    return () => {
+      window.removeEventListener("beforeunload", onBeforeUnload);
+      document.removeEventListener("click", onLinkClick, true);
+    };
+  }, [sectionTitle]);
+
   const saveOrder = useCallback(async (updated: Member[]) => {
     setMembers(updated);
     const res = await adminFetch("/api/admin/team/reorder", {