fix(video): recognize "S1"/"S2"-style season folders, not just full words

Found live: a real show organized its first season as "House.of.the.Dragon.
S01E01...mkv" inside a folder named "S1" (the show name embedded in every
filename, so grouping worked by guessit's own title alone), but its later
seasons as "S02E01. Episode's Own Title.mkv" inside "S2"/"S3" — no show
name in any filename at all, relying entirely on the folder. Those seasons
showed up as loose individual entries instead of grouped under the show:
season_from_folder_name only recognized "season"/"saison"/"livre" as full
words, so "S2" didn't register as a season folder at all, and the
ancestor-based show-grouping fix (previous commits) never triggered for
those seasons.

A bare "S" + 1-2 digits as the *whole* folder name is now recognized too —
anchored to the entire name so it can't match some unrelated folder that
merely starts with "s" followed by digits.

2 files changed, 27 insertions, 0 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py b/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py
index 985bd7a..24b423e 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py
@@ -45,6 +45,12 @@ _SEASON_RE = re.compile(
     re.IGNORECASE,
 )
 _SPECIALS_RE = re.compile(r"\b(?:bonus|extras?|specials?)\b", re.IGNORECASE)
+# A bare "S" + number as the *whole* folder name — "S1", "S2", "S02" — a
+# common abbreviated convention distinct from SEASON_WORDS' full words.
+# Anchored to the entire name, not just `\b`-bounded within a longer
+# string, so it only matches a folder actually named just that — never
+# some other word that merely starts with "s" followed by digits.
+_SEASON_ABBREV_RE = re.compile(r"^s(\d{1,2})$", re.IGNORECASE)
 
 _ROMAN_NUMERALS = {
     2: "II", 3: "III", 4: "IV", 5: "V", 6: "VI",
@@ -110,6 +116,9 @@ def season_from_folder_name(name: str) -> int | None:
     """
     if _SPECIALS_RE.search(name):
         return 0
+    m = _SEASON_ABBREV_RE.match(name.strip())
+    if m:
+        return int(m.group(1))
     m = _SEASON_RE.search(name)
     if not m:
         return None
diff --git a/packages/meshbay-node/tests/test_title_parse.py b/packages/meshbay-node/tests/test_title_parse.py
index cf51646..5f0977c 100644
--- a/packages/meshbay-node/tests/test_title_parse.py
+++ b/packages/meshbay-node/tests/test_title_parse.py
@@ -119,6 +119,24 @@ def test_season_folder_book_word_roman_numeral():
     assert season_from_folder_name("Livre VI") == 6
 
 
+def test_season_folder_bare_s_abbreviation():
+    # A common abbreviated convention distinct from SEASON_WORDS' full
+    # words — found live: a show with "S1"/"S2"/"S3" folders instead of
+    # "Season 1" etc, exactly the shape that grouped its later seasons as
+    # loose individual entries rather than under the show.
+    assert season_from_folder_name("S1") == 1
+    assert season_from_folder_name("S2") == 2
+    assert season_from_folder_name("S02") == 2
+
+
+def test_season_folder_bare_s_abbreviation_does_not_match_inside_a_longer_name():
+    # Anchored to the whole folder name — a real folder that merely starts
+    # with "S" followed by digits somewhere in a longer, unrelated name
+    # must not be read as a season abbreviation.
+    assert season_from_folder_name("S1 Extended Cut") is None
+    assert season_from_folder_name("Something2") is None
+
+
 def test_specials_folder_maps_to_season_zero():
     assert season_from_folder_name("Specials") == 0
     assert season_from_folder_name("Bonus") == 0