iPad: no text selection or image menu on press-and-hold, no accidental pinch or double-tap zoom, fields stay at 16px so focus does not zoom

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

public/boot.js

@@ -1,5 +1,7 @@
 'use strict';
 // ---- Boot
+// Stop the accidental pinch zoom on iPads (Safari ignores user-scalable=no). Double-tap zoom is stopped in the CSS (touch-action: manipulation).
+for (const ev of ['gesturestart', 'gesturechange', 'gestureend']) document.addEventListener(ev, e => e.preventDefault(), { passive: false });
 (async () => {
   try { cfg = { ...cfg, ...(await (await fetch('/api/config')).json()) }; } catch {}
   const loadedBuild = cfg.build;