Spotify Controller:
- Shows current track title, artist, album
- Displays position/duration time
- Progress bar updates in real-time
- Fetches info from Spotify every second
- Album art placeholder (💿)
- Volume slider with visual feedback
Calculator:
- Windows Calculator layout
- Memory buttons (MC, MR, M+, M-, MS, M~)
- Scientific functions (1/x, x², √x)
- Standard operators with proper styling
- Blue equals button like Windows
- Backspace, CE, C, % buttons
- +/- sign toggle
- Memory operations working
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