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/database.py

@@ -9,11 +9,10 @@ import logging
 import sqlite3
 import threading
 from contextlib import contextmanager
-from datetime import datetime
 from pathlib import Path
 from typing import Any
+
 from werkzeug.security import generate_password_hash
-from config import ADMIN_USERNAME, ADMIN_PASSWORD
 
 logger = logging.getLogger('intercept.database')
 
@@ -255,9 +254,10 @@ def init_db() -> None:
 
         cursor = conn.execute('SELECT COUNT(*) FROM users')
         if cursor.fetchone()[0] == 0:
-            from config import ADMIN_USERNAME, ADMIN_PASSWORD
             import secrets as _secrets
 
+            from config import ADMIN_PASSWORD, ADMIN_USERNAME
+
             admin_password = ADMIN_PASSWORD
             if not admin_password:
                 admin_password = _secrets.token_urlsafe(16)