Retry oversized video downloads instead of giving up permanently

VK can briefly serve a not-yet-transcoded master stream on a capped-height
URL right after a video is published, tripping the size check on the very
first attempt. Treat that as transient (retry with a longer backoff) instead
of failing permanently, and merge the fallback note into a single "Смотреть
видео в VK" link instead of two separate lines.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/text_formatter.py

@@ -154,18 +154,18 @@ def build_media_unavailable_note(
         media_type = str(getattr(item, "media_type", "медиа") or "медиа")
         if not url:
             continue
-        label = "Смотреть видео" if media_type == "video" else media_type
-        if parse_mode == "html":
-            lines.append(f'- <a href="{html.escape(url, quote=True)}">{html.escape(label)}</a>')
+        if media_type == "video":
+            target = vk_url or url
+            label = "Смотреть видео в VK"
         else:
-            lines.append(f"- {label}: {url}")
+            target = url
+            label = media_type
+        if parse_mode == "html":
+            lines.append(f'- <a href="{html.escape(target, quote=True)}">{html.escape(label)}</a>')
+        else:
+            lines.append(f"- {label}: {target}")
     if not lines:
         return ""
-    if vk_url:
-        if parse_mode == "html":
-            lines.append(f'- <a href="{html.escape(vk_url, quote=True)}">Открыть пост в VK</a>')
-        else:
-            lines.append(f"- пост в VK: {vk_url}")
     header = "Не поместилось в пост:"
     if parse_mode == "html":
         header = f"<i>{html.escape(header)}</i>"