Live bundle: encode radar textures as lossless WebP (method=4) instead of PNG — ~25% smaller bundles, lossless (gray values unchanged). Client loads textures as image/webp; logo + downloaded export stills stay PNG.

Live: every site uses the low-latency chunk feed (in-progress volumes shown), archive-bucket fallback. Short-lived caches now that all sites cache: drop a site's decoded volumes ~10 min after last view (touch-on-read LRU, _CHUNK_TTL=600s); chunk files pruned at ~80 min (covers the 65-min loop); live cache ttl 45s + rtsec 120s for all sites.

UI + export: rename 'Load hour' button to 'Go', hide the 'Download raw' button; export zoom now matches the on-screen view — contain the visible extent at the same scale (anchor width/height by aspect) across single / quad / Z+V exports.

Lowest-sweep-only: render just the lowest elevation cut(s) (LOW_SWEEP_TOL=0.15) so a site's 0.3 deg supplemental cut hides its 0.5 deg cut (e.g. KBUF). Applied to the xradar render path (_tree_to_frames) and the dealias path (_dealias_dtree). Server-side sweep selection.

Re-apply Py-ART elimination on stable base: xradar fork = sole ingest, dealias via region_dealias.sweep_folds on xradar arrays (Nyquist from ds['nyquist_velocity'], max|V| fallback), bundled nexrad_sites.py coords (replaces pyart NEXRAD_LOCATIONS), removed _process_pyart fallback, dropped arm-pyart. Server-side only — no live-default/UI changes (built on a4cbd62).

Cosmetic update on stable base: title -> 'NEXRAD Level 2 low level sweep browser', remove Py-ART processing credit (+ add (S. Nesbitt) to region-dealias), one consistent dvh map height + tighter mobile layout. Text/CSS only — no ingest/functional changes.

Remove debug instrumentation from app.py (revert thread-pool gate + breadcrumbs from abandoned Mac-app debugging)

macOS bundle: eliminate fork() — thread decode pool (NEXRAD_INPROC_POOL) + open browser via os.posix_spawn (Obj-C process aborts on fork)

Guard background daemons under start_background() for macOS spawn-safety; add desktop launcher (pywebview)

Site picker: switch radar in place with progress bar (no full reload)

Site picker: use curated WSR-88D list (sites.py), not all NEXRAD_LOCATIONS (drops TDWR)

Add in-map radar-site picker overlay + block-I favicon

Live: server-side poller keeps recently-viewed sites' chunks fresh

Live: check the chunk feed for new scans every minute (Timer 120->60s)

Hide redundant top Field dropdown (use the in-map field selector)

Nudge map height offset 160->170 to fit footer (measured ideal ~169)

Full-bleed layout: override Gradio's 1280px centered main; 2px edges

Tighten layout: ~2px edges, collapse inter-element gaps, fill map

Use more of the window: compact header + fix map height offsets

Header: credit CliMAS / Univ. of Illinois (climas.illinois.edu)

Show the radar site ID in the page (tab) title

Dealias: keep the current frame instead of resetting

Live autoupdate: never grey the display

Warnings: add flash flood warnings (FF) as green polygons

Log active dealias engine at startup (greppable in Space logs)

Progress bar: label the active dealiaser (Rust region-dealias vs Py-ART)

Footer: credit the Rust region-dealias dealiaser

Use region-dealias (Rust) for dealiasing, with pyart fallback

Export: add units to the quad/Z+V mini colorbars

Fix shared Z+V link: add ZVF to field dropdown choices

Share link: always build an absolute URL

Force-refresh: stop spinner as soon as server reports done

Live: add forced-refresh button (snappy, in-place)

Loop: dwell on last frame 4x the frame interval

Warning polygons: 0.25pt black buffer (casing)

Z+V orientation toggle + visibly grey Live time dropdowns

Live mode: in-place frame updates (no more iframe reload / grey-out)

Velocity colormap -> CMasher fusion_r

Add 2x1 (Z over V) mode + propagate to exports

Draw warnings on exports + max-quality mp4

Drop expired warnings from the loop

Add 24h age cap to volume cache pruning

Protect cities.json/warnings.json from LRU cache pruning

Finer-grained export colorbar tick labels

Quad (2x2) export for stills and movies

Live view opens on newest frame

Fix pin script timing (run immediately, not on DOMContentLoaded)

Fix embedded-view map height ratchet (pin px height when framed)

Live mode: gr.Timer server-side refresh

Live mode: setInterval auto-refresh (survive cache-hit non-rerenders)