v11.9: Stem Time Filter & "What Changed?" Chips

Stem Time filter — set a minimum lead time (in minutes) before pickup and the booker ignores loads that start too soon to reach. Off by default; sits right next to Max Stops.
"What changed?" chips on every flagged load — green for payout increases, a red-tinted chip for decreases, and a sparkle for brand-new loads. Colors mirror Amazon's own highlight so the chips look native.
"Skipped by you" chip — press Start again without booking a flagged load and a muted tag shows what you've already passed on. Resets when you change filters or reload.
Sharper diff detection — a longer-memory cache with a 5-minute freshness window means the bot stops on real payout bumps even after a Start/Stop cycle, and won't fire on stale ones.
Cleaner card highlighting — the red border and sky-blue background now wrap the whole card (a thin 2px outline with square corners). The old brick-red "+X" label is gone — the chip replaces it.

Stem Time Filter & "What Changed?" Chips