fix(video): fix two remaining bugs in Specials numbering and long-season episodes

1. A season spanning more than one folder (a per-book Bonus folder nested
   inside every numbered season) got the same synthetic episode numbers
   handed out again in each folder independently — three unrelated
   Specials all showing up as "S0E01". _synthetic_episode_number now ranks
   across the whole show for the target season, not just one file's own
   folder.

2. guessit reads a bare 3-digit leading episode number as a concatenated
   season+episode guess rather than a plain episode number — "100" parses
   as season=1, episode=0, not episode=100, with nothing in its output
   distinguishing that from a real 2-digit episode. A season-like ancestor
   already overrides guessit's season (previous commit); this applies the
   same fix to episode via a direct regex on the leading number, capped at
   3 digits so a leading year (4 digits) is never misread the same way.

Both confirmed against the real library this whole fix was found on:
per-book Bonus features across two books no longer collide, and a real
100th-episode file now resolves to episode 100 instead of 0.

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