Add a transition lock to toggleTheme so that consecutive clicks during
the view-transition animation are ignored, avoiding stacked GPU-heavy
clip-path animations and redundant ECharts instance recreation.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Track account usage windows from the first use or reset cycle.
Render today's request health timeline with availability levels and polish dashboard card layout.
Co-authored-by: Codex <noreply@openai.com>