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/wifi/parsers/nmcli.py

@@ -11,30 +11,28 @@ from __future__ import annotations
 import logging
 import re
 from datetime import datetime
-from typing import Optional
 
-from ..models import WiFiObservation
 from ..constants import (
-    SECURITY_OPEN,
-    SECURITY_WEP,
-    SECURITY_WPA,
-    SECURITY_WPA2,
-    SECURITY_WPA3,
-    SECURITY_WPA_WPA2,
-    SECURITY_WPA2_WPA3,
-    SECURITY_ENTERPRISE,
-    SECURITY_UNKNOWN,
+    AUTH_EAP,
+    AUTH_OPEN,
+    AUTH_PSK,
+    AUTH_SAE,
+    AUTH_UNKNOWN,
     CIPHER_CCMP,
     CIPHER_TKIP,
     CIPHER_UNKNOWN,
-    AUTH_PSK,
-    AUTH_SAE,
-    AUTH_EAP,
-    AUTH_OPEN,
-    AUTH_UNKNOWN,
+    SECURITY_ENTERPRISE,
+    SECURITY_OPEN,
+    SECURITY_UNKNOWN,
+    SECURITY_WEP,
+    SECURITY_WPA,
+    SECURITY_WPA2,
+    SECURITY_WPA2_WPA3,
+    SECURITY_WPA3,
+    SECURITY_WPA_WPA2,
     get_channel_from_frequency,
-    get_band_from_frequency,
 )
+from ..models import WiFiObservation
 
 logger = logging.getLogger(__name__)
 
@@ -62,7 +60,7 @@ def parse_nmcli_scan(output: str) -> list[WiFiObservation]:
     return observations
 
 
-def _parse_nmcli_line(line: str) -> Optional[WiFiObservation]:
+def _parse_nmcli_line(line: str) -> WiFiObservation | None:
     """Parse a single line of nmcli terse output."""
     try:
         # nmcli terse format uses : as delimiter but escapes colons in values with \:
@@ -188,7 +186,7 @@ def _parse_nmcli_security(security_str: str) -> tuple[str, str, str]:
     cipher = CIPHER_UNKNOWN
     if security in (SECURITY_WPA2, SECURITY_WPA3, SECURITY_WPA2_WPA3, SECURITY_ENTERPRISE):
         cipher = CIPHER_CCMP
-    elif security == SECURITY_WPA or security == SECURITY_WPA_WPA2:
+    elif security in (SECURITY_WPA, SECURITY_WPA_WPA2):
         cipher = CIPHER_TKIP  # Often TKIP for mixed mode
 
     # Determine auth