🎨 Palette: Fix theme flash and ensure reliable dark mode switching

[APPLEPIE6969]

This PR addresses the user request to "very important make theme switching work" by implementing a standard solution for Next.js + Tailwind dark mode flash (FOUC).

• Added: Inline script in app/layout.tsx to read localStorage or prefers-color-scheme and apply the dark class to html if needed.
• Verified: Theme switching works correctly between Light Mode (Standard/Purple) and Dark Mode (#000000).
• UX Improvement: Eliminates the white flash for dark mode users on page load.

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PR created automatically by Jules for task 15395679074945339394 started by @APPLEPIE6969

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Project	Deployment	Actions	Updated (UTC)
studyflow	Ready	Preview, Comment	Feb 19, 2026 1:13pm