Platform Performance & Stability Fixes

We fixed a bunch of things under the hood that you might have noticed: - Dashboard no longer shows stale portfolio data — holdings update in real-time now - Coin pages no longer break when price data is temporarily unavailable - Video cooldown now works correctly for free users - Fees data no longer gets overwritten with outdated numbers - Overall faster page loads thanks to better caching Nothing flashy, but everything should feel snappier and more reliable.