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>

tests/test_deauth_detector.py

@@ -9,17 +9,17 @@ from unittest.mock import MagicMock, patch
 
 sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
 
+from utils.constants import (
+    DEAUTH_ALERT_THRESHOLD,
+    DEAUTH_CRITICAL_THRESHOLD,
+    DEAUTH_DETECTION_WINDOW,
+)
 from utils.wifi.deauth_detector import (
+    DEAUTH_REASON_CODES,
+    DeauthAlert,
     DeauthDetector,
     DeauthPacketInfo,
     DeauthTracker,
-    DeauthAlert,
-    DEAUTH_REASON_CODES,
-)
-from utils.constants import (
-    DEAUTH_DETECTION_WINDOW,
-    DEAUTH_ALERT_THRESHOLD,
-    DEAUTH_CRITICAL_THRESHOLD,
 )
 
 
@@ -515,9 +515,7 @@ class TestDeauthDetectorIntegration:
                 return True
             if 'Dot11Disas' in str(layer):
                 return False
-            if 'RadioTap' in str(layer):
-                return True
-            return False
+            return 'RadioTap' in str(layer)
 
         mock_pkt.haslayer = haslayer_side_effect