fix: Add missing Flask 'g' import to routes.py

- Fix NameError: name 'g' is not defined in get_match_timer_state() function
- Add 'g' to Flask imports in routes.py
- This resolves the 500 error when accessing /api/match-timer/state endpoint

mbetterclient/web_dashboard/routes.py

@@ -5,7 +5,7 @@ Flask routes for web dashboard
 import logging
 import time
 from datetime import datetime
-from flask import Blueprint, render_template, request, jsonify, redirect, url_for, flash, session
+from flask import Blueprint, render_template, request, jsonify, redirect, url_for, flash, session, g
 from flask_login import login_required, current_user, login_user, logout_user
 from werkzeug.security import check_password_hash
 from werkzeug.utils import secure_filename