Ports lastfm-stats-web's dataset table: a sortable/searchable table over the top-50 artists/tracks/albums with CSV export, plus a click-through detail modal showing animated stats (scrobbles, weeks active, best rank, best month) and an artist rank-over-time line chart. Scoped to the aggregator's existing top-50 cap rather than the full listening history — lifting that cap would need aggregator.ts changes that are out of scope here. Registers Chart.js's LineController, needed for the new rank-over-time chart and not previously used by any chart. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>