refactor(web-test): извлечены detect-new-form и edit-state из inline в dom/

Дедуплицированы 15 копий detect-new-form (13 в row-fill + 2 локальные
обёртки в select-value), 6 копий INPUT-focused, 4 проверки calendar/
calculator popup, 1 INPUT-focused-inside-grid.

Новое:
- dom/forms.mjs: detectNewFormScript(prev, {strict}) — объединяет broad
  и strict варианты
- dom/edit-state.mjs: isInputFocusedScript({allowTextarea}),
  isInputFocusedInGridScript, findOpenPopupScript
- helpers.mjs: переписан detectNewForm на dom-script; добавлены тонкие
  обёртки isInputFocused, isInputFocusedInGrid, findOpenPopup

Метрики row-fill: 1235 → 1065 LOC (−170), inline page.evaluate 47 → 20.
Поведение идентично; точечный регресс зелёный (02/03/05/06/10/16).
04-selectvalue auto-history шаг — pre-existing baseline issue (state-
driven, не связан с S1, воспроизводится на HEAD).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/skills/web-test/scripts/dom/edit-state.mjs

@@ -0,0 +1,53 @@
+// web-test dom/edit-state v1.0 — focus and popup detection inside the 1C web client
+// Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
+
+/**
+ * Is the currently focused element an INPUT (optionally TEXTAREA too)?
+ * Returns boolean.
+ *
+ * @param {object} [opts]
+ * @param {boolean} [opts.allowTextarea=false] — also return true for TEXTAREA.
+ */
+export function isInputFocusedScript({ allowTextarea = false } = {}) {
+  const cond = allowTextarea
+    ? `f.tagName === 'INPUT' || f.tagName === 'TEXTAREA'`
+    : `f.tagName === 'INPUT'`;
+  return `(() => {
+    const f = document.activeElement;
+    return !!(f && (${cond}));
+  })()`;
+}
+
+/**
+ * Is the currently focused INPUT/TEXTAREA inside a `.grid` ancestor?
+ * Used to verify grid edit-mode (active cell editor).
+ * Returns boolean.
+ */
+export function isInputFocusedInGridScript() {
+  return `(() => {
+    const f = document.activeElement;
+    if (!f || (f.tagName !== 'INPUT' && f.tagName !== 'TEXTAREA')) return false;
+    let n = f;
+    while (n) {
+      if (n.classList?.contains('grid')) return true;
+      n = n.parentElement;
+    }
+    return false;
+  })()`;
+}
+
+/**
+ * Is a calculator (`.calculate`) or calendar (`.frameCalendar`) popup visible?
+ * Returns `'calculator' | 'calendar' | null`.
+ *
+ * For the "popup gone" check, callers use: `!await findOpenPopup()`.
+ */
+export function findOpenPopupScript() {
+  return `(() => {
+    const calc = document.querySelector('.calculate');
+    if (calc && calc.offsetWidth > 0) return 'calculator';
+    const cal = document.querySelector('.frameCalendar');
+    if (cal && cal.offsetWidth > 0) return 'calendar';
+    return null;
+  })()`;
+}