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

apps/solvecraft-web/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
+  <title>SolveCraft</title>
+  <link data-trunk rel="rust" data-bin="solvecraft-web" data-wasm-opt="z" data-weak-refs />
+  <style>
+    html, body { margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; background: #e8ebf0; }
+    #solvecraft_canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
+    #solvecraft_loading { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center;
+      color: #4a5060; font: 14px system-ui, sans-serif; pointer-events: none; }
+  </style>
+</head>
+<body>
+  <canvas id="solvecraft_canvas"></canvas>
+  <div id="solvecraft_loading">Loading SolveCraft&hellip;</div>
+</body>
+</html>