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Add theme switching capability with light, dark, and system modes: - Enable Tailwind CSS dark mode with class strategy - Add CSS variables for theme-aware semantic colors - Create ThemeProvider context for managing theme state - Add ThemeToggle component in side menu and account settings - Persist theme preference to user dashboard preferences - Include ThemeScript to prevent flash of wrong theme on load Slack thread: https://triggerdotdev.slack.com/archives/C04CR1HUWBV/p1769765128711039 https://claude.ai/code/session_01VDVgh75Xa4LA9YH9aFLnjB