fix: WCEnd editor modal pre-loads correct colour and errno value

- Default colour now checks dataset.exitError instead of tagName === 'WC-END',
  so success (exit 0) END blocks default to blue, error END blocks to red
- _selectByCode now also sets the HTML value attribute via setAttribute(),
  ensuring cloneNode(true) preserves the formatted display value
- Add 4 regression tests for colour defaults, attribute sync, and clone value

blocks-algo.js

@@ -118,11 +118,15 @@ class WCEnd extends WCBlock {
     this._selectedCode = code;
     const item = this._errnoItems.find(i => i.code === code);
     if (item) {
-      this._el.input.value = code + "  " + item.name;
+      const display = code + "  " + item.name;
+      this._el.input.value = display;
+      this._el.input.setAttribute("value", display);
       this._el.desc.textContent = item.desc;
       this.dataset.exitError = code !== 0 ? "true" : "";
     } else {
-      this._el.input.value = code + "  error";
+      const display = code + "  error";
+      this._el.input.value = display;
+      this._el.input.setAttribute("value", display);
       this._el.desc.textContent = "unknown error";
       this.dataset.exitError = "true";
     }

helpers.js

@@ -382,7 +382,7 @@ function showBlockEditor(block) {
   body.innerHTML = "";
 
   /* Colour picker row; error blocks default to red, others to blue */
-  const defaultColor = block.classList.contains("error-path") || block.tagName === "WC-END" ? "#ef5350" : "#4a90d9";
+  const defaultColor = block.classList.contains("error-path") || block.dataset.exitError ? "#ef5350" : "#4a90d9";
   const colorRow = document.createElement("div");
   colorRow.className = "block-editor-color-row";
   colorRow.innerHTML =

tests/app/test-runner.js

@@ -421,6 +421,60 @@ const APP_TEST_SUITE = {
       });
     });
 
+    this._group("WCEnd editor modal", () => {
+      this._test("selectByCode sets value attribute for clone", () => {
+        const end = $id("main-end");
+        end._selectByCode(42);
+        const input = end.querySelector(".end-errno-input");
+        const attr = input.getAttribute("value");
+        if (attr !== "42  error") throw Error("expected '42  error', got: '" + attr + "'");
+        end._selectByCode(0);
+        const attr0 = input.getAttribute("value");
+        if (attr0 !== "0  success") throw Error("expected '0  success', got: '" + attr0 + "'");
+      });
+
+      this._test("editor modal defaults to blue for success end", () => {
+        const end = $id("main-end");
+        end._selectByCode(0);
+        showBlockEditor(end);
+        const overlay = $id("block-editor-overlay");
+        if (!overlay) throw Error("no overlay");
+        const picker = overlay.querySelector(".block-editor-color-picker");
+        if (!picker) throw Error("no picker");
+        if (picker.value !== "#4a90d9") throw Error("expected blue (#4a90d9), got: " + picker.value);
+        const cancel = overlay.querySelector(".block-editor-cancel");
+        if (cancel) cancel.click();
+      });
+
+      this._test("editor modal defaults to red for error end", () => {
+        const end = $id("main-end");
+        end._selectByCode(42);
+        showBlockEditor(end);
+        const overlay = $id("block-editor-overlay");
+        if (!overlay) throw Error("no overlay");
+        const picker = overlay.querySelector(".block-editor-color-picker");
+        if (!picker) throw Error("no picker");
+        if (picker.value !== "#ef5350") throw Error("expected red (#ef5350), got: " + picker.value);
+        const cancel = overlay.querySelector(".block-editor-cancel");
+        if (cancel) cancel.click();
+        end._selectByCode(0);
+      });
+
+      this._test("editor modal clone shows correct errno value", () => {
+        const end = $id("main-end");
+        end._selectByCode(9);
+        showBlockEditor(end);
+        const overlay = $id("block-editor-overlay");
+        if (!overlay) throw Error("no overlay");
+        const cloneInput = overlay.querySelector(".end-errno-input");
+        if (!cloneInput) throw Error("no clone input");
+        if (cloneInput.value !== "9  error") throw Error("expected '9  error', got: '" + cloneInput.value + "'");
+        const cancel = overlay.querySelector(".block-editor-cancel");
+        if (cancel) cancel.click();
+        end._selectByCode(0);
+      });
+    });
+
     this._group("Regression tests", () => {
       this._test("WCEnd click-outside uses contains() not closest(this)", () => {
         const end = $id("main-end");