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/media_processor.py

@@ -112,11 +112,16 @@ class MediaProcessor:
                 return path, err, is_permanent
             last_result = (path, err, is_permanent)
             if attempt <= settings.yt_dlp_retry_attempts:
+                # A fresh upload's lower-quality renditions can still be mid-transcode on
+                # VK's side - the "720p" URL then briefly serves the full-res master until
+                # the ladder catches up, which trips our size cap. That's not a permanent
+                # rejection, just needs more time than a stalled connection does.
+                delay = 60.0 if "exceeds size limit" in (err or "") else 3.0
                 logger.warning(
-                    "yt-dlp attempt {}/{} failed transiently for {}: {} - retrying",
-                    attempt, settings.yt_dlp_retry_attempts + 1, url, err,
+                    "yt-dlp attempt {}/{} failed transiently for {}: {} - retrying in {}s",
+                    attempt, settings.yt_dlp_retry_attempts + 1, url, err, delay,
                 )
-                await asyncio.sleep(3.0)
+                await asyncio.sleep(delay)
         return last_result
 
     async def _download_video_ytdlp_attempt(
@@ -219,7 +224,7 @@ class MediaProcessor:
             )
             output_path.unlink(missing_ok=True)
             await unregister_active_path(output_path)
-            return None, "video exceeds size limit", True
+            return None, "video exceeds size limit", False
 
         return output_path, None, False