Replace per-upload Astro build threads with a single background worker
(_site_rebuild_worker) that waits on an event, sleeps 60 s to let upload
bursts settle, then runs one full build + rsync. 271 concurrent uploads now
produce one build instead of 271 serialised builds, eliminating the OOM kill.
--webroot is re-enabled; merge-only path still runs immediately per upload.
Also: date filter row added to ActivityFeed.svelte (sport + date presets
with dynamic year pills); deploy/vps gitignored for VPS config backups.
Key at data_dir.parent/.garmin_key — nginx serves location /data/ { alias /var/bincio/data/; } so
anything inside that dir is reachable. The key lives one level up at /var/bincio/.garmin_key,
outside nginx's reach.
Two-layer storage — garmin_creds.json holds the encrypted email+password (needed for re-login when
tokens expire); garmin_session/ holds the garth OAuth tokens in plain JSON (short-lived, not the
user's actual password).
test_login() — called by the connect endpoint before saving anything, so credentials are only
persisted if they actually work.
get_client() — tries the session first (fast, no network), falls back to full re-login
transparently. The caller never needs to think about whether the session is fresh.