The Replays tab sorted by file time but each tile shows the match date,
so dates read out of order. It now sorts newest match first by the date
the tile shows.

Add Replay and dropping .vrf files gave no feedback. Both now go through
addReplays: a toast says what happened (added, already there, not a
replay Icarus can read), and the tab scrolls the first one into view and
lights the ring of each for a moment. A file whose match is already
listed isn't copied again, and one that isn't a readable replay isn't
copied at all.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>