Explore button moved to its own row below playlist cards with gradient,
search icon, and "Explore Selected Playlist" label. Impossible to miss.
Mode toggle redesigned as pill segmented control with grid/list icons.
Action bar buttons get inline SVG icons (checkmark, square, heart).
Primary buttons use gradient + glow shadow treatment.
Build hint shows "Select a playlist above, then explore" → updates to
"Ready: [name]" when playlist selected. Discovery poller refreshes
cards every 5s while active. Button re-enables as "Open" after modal
launch so user can reopen closed discovery modal.
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