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/smoke_test_bluetooth.py

@@ -17,10 +17,7 @@ Requirements:
 """
 
 import argparse
-import json
 import sys
-import time
-from typing import Any
 
 try:
     import requests
@@ -258,7 +255,7 @@ class SmokeTests:
     def run_all(self):
         """Run all smoke tests."""
         print(f"\n{'='*60}")
-        print(f"BLUETOOTH API SMOKE TESTS")
+        print("BLUETOOTH API SMOKE TESTS")
         print(f"Target: {self.base_url}")
         print(f"{'='*60}")