The globe draws the poles as they are, and nothing while idle

The globe is a UV sphere: towards the poles its triangles narrow to
slivers, and texture coordinates interpolated across them pinched the
map into a star around each pole. Each pixel now computes its own
coordinates from its exact point on the sphere, with seam-safe mipmap
gradients; the map wraps horizontally and gets 8x anisotropic
filtering.

That showed a flaw in the day texture: NASA's mosaic has a lighter
strip at its east edge near the poles, a line from each pole once drawn
exactly. The day texture is now built from NASA's original Blue Marble
(December 2004) by tools/globe/prepare-day-texture.py, which blends
that strip into the map where both sides of the seam agree; same
4096x2048 size, provenance and hashes in SOURCES.md.

globe.gl redrew 60 times a second even when nothing moved; it now draws
only during camera flights, hover pulses, auto-rotation and the
reader's drags, so an idle globe costs no GPU time.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

CLAUDE.md

@@ -200,7 +200,11 @@ supplies:
 - **The globe** (`wwwroot/js/globe.js`, an ES module imported by `GlobePanel`) runs on globe.gl, vendored in
   `wwwroot/vendor/globe/` with its textures (`SOURCES.md` has versions, licences and hashes; the service worker never
   precaches it). It looks at the spherical mean of the located posts in view, pulses and draws an arc to a hovered
-  post, follows the theme (day/night texture), honours `prefers-reduced-motion` and pauses while hidden. CDN-fronted
+  post, follows the theme (day/night texture), honours `prefers-reduced-motion`, and draws only while something moves
+  (idle, it costs no GPU time; `wake()` before anything that animates). Each pixel computes its own map coordinates
+  from its point on the sphere (`sharpen`), so the poles don't pinch; the map wraps horizontally and gets 8×
+  anisotropic filtering (`keepSharp`). The day texture is NASA's, its seam repaired by
+  `tools/globe/prepare-day-texture.py` (dev-only, needs Pillow). CDN-fronted
   posts are labels per CDN on a ring at 68°N, never a place; hovering one draws its arc there and a ring where the server
   was before the CDN. The posts'
   places reach it in one call per feed change; cards are matched by `data-post-id`.