Frontend add dashboard icon (#32)

* feat(frontend): basic dashboard showing current LED screen data

* Update the dashboard UI

* Add a Skip Category button to the dashboard

* Add a Switch Category dropdown to the dashboard

* Extend the current dashboard into a more realistic secure admin/control system.

* refactor dashboard admin UI: modal login and controls, compact styling, improved CSS/JS layout

* clean repo and ignore runtime/cache files

* Remove the Service Control feature from the admin dashboard

* UI: improve admin modal layout after Service Control removal

* Add a browser tab icon

* icong for web tap

* icong for web tab

* Update index.html

* fix icong for web tap

chore: keep __init__.py as package marker

keep __init__.py as package marker