v2.26.0: fix SSE fanout crash and branded logo FOUC

- Fix SSE fanout thread AttributeError when source queue is None during
  interpreter shutdown by snapshotting to local variable with null guard
- Fix branded "i" logo rendering oversized on first page load (FOUC) by
  adding inline width/height to SVG elements across 10 templates
- Bump version to 2.26.0 in config.py, pyproject.toml, and CHANGELOG.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

utils/dsc/__init__.py

@@ -7,18 +7,17 @@ and routine communications per ITU-R M.493.
 """
 
 from .constants import (
-    FORMAT_CODES,
-    DISTRESS_NATURE_CODES,
-    TELECOMMAND_CODES,
     CATEGORY_PRIORITY,
+    DISTRESS_NATURE_CODES,
+    FORMAT_CODES,
     MID_COUNTRY_MAP,
+    TELECOMMAND_CODES,
 )
-
 from .parser import (
-    parse_dsc_message,
     get_country_from_mmsi,
     get_distress_nature_text,
     get_format_text,
+    parse_dsc_message,
 )
 
 __all__ = [