Fix web homing motion and synchronize preview state

web/worker/wasm-home-limit.mjs

@@ -108,6 +108,17 @@ export class WasmHomeLimit {
     return this.read();
   }
 
+  // Resolve the canonical target of a home command without committing the
+  // homed mask or pose. The actual commit is performed only after the LinuxCNC
+  // TP has executed the queued move to this target.
+  previewHome(axis = null) {
+    const saved = this.exportState();
+    const target = this.home(0, axis);
+    try { this.restoreState(saved); } catch (error) { return { status: "error", code: String(error?.message ?? error) }; }
+    if (target.status !== "verified") return target;
+    return { status: "verified", state: target.state };
+  }
+
   check(joints) {
     if (!this.available) return this.read();
     if (!Array.isArray(joints) || joints.length < this.jointCount || joints.some((value) => typeof value !== "number" || !Number.isFinite(value))) return { status: "error", code: "wasm_home_joints_invalid" };