Re-base every track + image timestamp so each hike starts at 08:00 on the
build date, preserving all relative timing (total duration, per-stage gaps,
photo "nach X"). The per-hike track JSON is the single source for the page
metrics and the client-built GPX download, so both come out anonymized; the
real recording times stay only in the private source track.gpx.
Also close two stale-data leaks that would otherwise still expose real
times: sweep prior-build track.*.json (keep only the current hash) and
remove orphan slug dirs from static/ (renamed/deleted hikes).
Alexander
a2869c1d87
