AthleteView: use segmentsFetched flag to prevent infinite fetch loop when
there are no efforts (segmentSummary.length === 0 was re-triggering the
reactive statement after every empty response). Also improve empty state
message and reset flag after rescan so the table reloads.
astro.config.mjs: extend shell fallback plugin to cover /segments/{id}/
the same way /activity/{id}/ is handled, so segment detail pages work in
the dev server without nginx.
Davide Scaini
59cf99f0af