fix: remove fallback content, fix video upload and positioning

- Remove hardcoded fallback data — DB is sole content source
- Sections render conditionally when data exists
- Hero video slots save after each upload (not only when all 3 filled)
- Video positions preserved (left/center/right) with empty string slots
- Client-side 10MB hard limit on video uploads with clear error
- Server-side upload error handling for body size limits
- Guard Team section against empty members array
- Clean up old uploaded images and videos

src/app/admin/hero/page.tsx

@@ -6,7 +6,7 @@ import { InputField } from "../_components/FormField";
 import { adminFetch } from "@/lib/csrf";
 import { Upload, X, Loader2, Smartphone, Monitor, Star } from "lucide-react";
 
-const MAX_VIDEO_SIZE_MB = 8;
+const MAX_VIDEO_SIZE_MB = 10;
 const MAX_VIDEO_SIZE_BYTES = MAX_VIDEO_SIZE_MB * 1024 * 1024;
 
 function formatFileSize(bytes: number): string {
@@ -209,10 +209,8 @@ function VideoManager({
   const syncToParent = useCallback(
     (updated: (string | null)[]) => {
       setSlots(updated);
-      // Only propagate when all 3 are filled
-      if (updated.every((s) => s !== null)) {
-        onChange(updated as string[]);
-      }
+      // Save all 3 slots (empty string for unfilled) to preserve positions
+      onChange(updated.map((s) => s || ""));
     },
     [onChange]
   );
@@ -246,10 +244,10 @@ function VideoManager({
   async function handleUpload(idx: number, file: File) {
     if (file.size > MAX_VIDEO_SIZE_BYTES) {
       const sizeMb = (file.size / (1024 * 1024)).toFixed(1);
-      setSizeWarning(`Видео ${sizeMb} МБ — рекомендуем до ${MAX_VIDEO_SIZE_MB} МБ для быстрой загрузки`);
-    } else {
-      setSizeWarning(null);
+      alert(`Видео ${sizeMb} МБ — максимум ${MAX_VIDEO_SIZE_MB} МБ. Сожмите видео и попробуйте снова.`);
+      return;
     }
+    setSizeWarning(null);
     setUploadingIdx(idx);
     try {
       const form = new FormData();
@@ -260,14 +258,21 @@ function VideoManager({
         body: form,
       });
       if (!res.ok) {
-        const err = await res.json();
-        alert(err.error || "Ошибка загрузки");
+        const text = await res.text();
+        let msg = "Ошибка загрузки";
+        try {
+          const err = JSON.parse(text);
+          msg = err.error || msg;
+        } catch { /* empty response */ }
+        alert(`${msg} (${res.status})`);
         return;
       }
       const { path } = await res.json();
       const updated = [...slots];
       updated[idx] = path;
       syncToParent(updated);
+    } catch (e) {
+      alert(`Ошибка сети: ${e instanceof Error ? e.message : "попробуйте снова"}`);
     } finally {
       setUploadingIdx(null);
     }
@@ -276,8 +281,7 @@ function VideoManager({
   function handleRemove(idx: number) {
     const updated = [...slots];
     updated[idx] = null;
-    setSlots(updated);
-    // Don't propagate incomplete state — keep old saved videos in DB
+    syncToParent(updated);
   }
 
   const allFilled = slots.every((s) => s !== null);
@@ -351,17 +355,17 @@ export default function HeroEditorPage() {
 
           <InputField
             label="Заголовок"
-            value={data.headline}
+            value={data.headline || ""}
             onChange={(v) => update({ ...data, headline: v })}
           />
           <InputField
             label="Подзаголовок"
-            value={data.subheadline}
+            value={data.subheadline || ""}
             onChange={(v) => update({ ...data, subheadline: v })}
           />
           <InputField
             label="Текст кнопки"
-            value={data.ctaText}
+            value={data.ctaText || ""}
             onChange={(v) => update({ ...data, ctaText: v })}
           />
         </>