Web: apps/solvecraft-web (Trunk, eframe web runner, WebGPU or WebGL2), cargo xtask wasm in ci, web-time clocks

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

Cargo.toml

@@ -41,6 +41,8 @@ image = { version = "0.25", default-features = false, features = ["png"] }
 # ui
 egui = "0.36"
 eframe = { version = "0.36", default-features = false }
+# Instant/SystemTime that also work in the browser (std panics on wasm32-unknown-unknown).
+web-time = "1"
 egui-wgpu = "0.36"
 rfd = "0.17"