fix(common): favourite check no longer calls the Europa League finished between matchdays (#670)

On 2026-09-29 ESPN's uefa.europa scoreboard still showed the 17 September
matchday, so every event was past. Its calendar is a "list" of rounds
(League Phase to 30 Jan 2027, then the knockout rounds to the final), not
a match-day whitelist, and the league's season type is a soccer id rather
than 2/3, so neither 3.6.1 rule applied and the check said the season had
finished.

When every event is past, a round in a list calendar that has not started
yet now draws no conclusion. Only a round's start date counts: end dates
are padded past the last game (AFL's Grand Final round still had a day to
run three days after the Grand Final), and rounds in an offseason phase
(college football's All-Star week) are skipped. Season end dates are still
ignored, so PLL (season to 2027-01-01) stays "finished", as do the World
Cup and AFL. Of 28 live ESPN scoreboards only uefa.europa's message changes.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -19,6 +19,16 @@ accepts both, but the store flags the old spelling as deprecated
 
 ## Unreleased
 
+### Fixes
+
+- The favourite-team check no longer says the Europa League season has
+  finished between matchdays. Its scoreboard keeps showing the last matchday,
+  and its calendar is a "list" of rounds rather than match days, so neither
+  3.6.1 rule applied. When every event is past, a round in a list calendar
+  that has not started yet (outside an offseason phase) now draws no
+  conclusion. PLL, the World Cup and AFL, whose seasons are over, are still
+  reported as finished: no round of theirs is still to start.
+
 ## 3.6.1
 
 A fix to `src.common.favorite_team_check` (#667). Plugins that drop their