feat(common): favorite_team_check and sports_timezone, promoted from the scoreboards (sports consolidation stage 2) (#665)

* feat(common): favorite_team_check and sports_timezone, promoted from the scoreboards (sports consolidation stage 2)

Two new hardware-free modules, taken from files the scoreboard plugins carry
as copies:

- src/common/favorite_team_check.py: FavoriteTeamCheck(logger, leagues), the
  seven byte-identical <sport>_favorite_check.py copies. Same code; the only
  additions are two type annotations (for the mypy ratchet).
- src/common/sports_timezone.py: resolve_timezone_name(), resolve_timezone(),
  system_timezone_name(), from the ten <sport>_timezone.py copies. They
  differed only in the plugin label named in the nothing-resolved warning and
  the write-back-bug values, which become keyword-only arguments
  (plugin_label, writeback_fixed_in). Same resolution order and log text.

Tests are ported from the plugins' own (test_favorite_check.py,
test_schedule_note_uses_game_dates.py, test_timezone_resolution.py; the
timezone ones run once per plugin's values and pin the exact warning text).
Both modules are on the mypy ratchet, in src/common/README.md, the CHANGELOG's
Unreleased section and SPORTS_UNIFICATION's module table. Nothing in core uses
them yet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* docs(common): bdf_font and json_body shipped in 3.5.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* chore(common): annotate the favourite check's deliberate except/pass for Bandit

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

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

mypy-clean.txt

@@ -21,6 +21,7 @@ src/common/__init__.py
 src/common/api_helper.py
 src/common/bdf_font.py
 src/common/espn_dates.py
+src/common/favorite_team_check.py
 src/common/font_layout.py
 src/common/frame_timing.py
 src/common/json_body.py
@@ -32,6 +33,7 @@ src/common/scroll_config.py
 src/common/snapshot_policy.py
 src/common/sports_card.py
 src/common/sports_scroll.py
+src/common/sports_timezone.py
 src/config_service.py
 src/core_config_keys.py
 src/deprecation.py