Real-world scenario from user logs: package "Drei.Meter.ueber.dem.Himmel.
S01GERMAN.DL.720P.WEB.X264-WAYNE" (note malformed S01GERMAN with no
separator) caused the auto-renamer to strip the source's S01E01..S01E08
episode tokens because SCENE_SEASON_ONLY_RE doesn't match a season followed
by an immediate letter (no separator).
Result: all 8 episodes in the season pack collapsed to the same target name
and collided in the MKV library with (2)(3)(4)(5)(6)(7)(8) suffixes.
Fix: After buildAutoRenameBaseNameFromFoldersWithOptions, check if the
source filename has a valid episode token. If yes:
1. If target has NO episode token: try to insert it via regex replacement
(Sxx<garbage> -> SxxExx.<garbage>), then via applyEpisodeTokenToFolderName.
If both fail, skip the rename entirely (preserve source name).
2. If target has a DIFFERENT episode token: skip the rename (mislabel risk).
This guard is the last line of defense against the helper's regex
limitations on malformed package names.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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