Add ticket status setter and prevent draft text loss

- Set ticket state (Offen / In Bearbeitung / Warten auf Schließen /
  Geschlossen) from the ticket detail page via a live PUT to Zammad;
  pending-close gets a default pending time and the change is synced back
  so it isn't flagged as an external change
- Replace the disruptive meta-refresh with a JS auto-refresh that pauses
  while a text field has unsent content or focus
- Persist reply/new-ticket drafts to localStorage and restore them after
  a reload or accidental navigation

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

static/app.js

@@ -0,0 +1,43 @@
+// Allgemeines Verhalten: Entwurf-Speicherung + ungefährlicher Auto-Refresh.
+(function () {
+  // --- 1) Entwürfe sichern (überlebt Reload / versehentliches Wegnavigieren) ---
+  function draftKey(el) {
+    return "episupport-draft:" + location.pathname + ":" + (el.name || el.id || "x");
+  }
+  var drafts = document.querySelectorAll("[data-draft]");
+  drafts.forEach(function (el) {
+    try {
+      var saved = localStorage.getItem(draftKey(el));
+      if (saved && !el.value) el.value = saved;
+    } catch (e) {}
+    el.addEventListener("input", function () {
+      try {
+        if (el.value) localStorage.setItem(draftKey(el), el.value);
+        else localStorage.removeItem(draftKey(el));
+      } catch (e) {}
+    });
+  });
+  // Beim Absenden die zugehörigen Entwürfe löschen
+  document.querySelectorAll("form").forEach(function (form) {
+    form.addEventListener("submit", function () {
+      form.querySelectorAll("[data-draft]").forEach(function (el) {
+        try { localStorage.removeItem(draftKey(el)); } catch (e) {}
+      });
+    });
+  });
+
+  // --- 2) Auto-Refresh, aber NIE während des Tippens/ungesendeten Texts ---
+  var INTERVAL = 120000; // 2 Minuten
+  function hasUnsavedInput() {
+    var a = document.activeElement;
+    if (a && /^(TEXTAREA|INPUT|SELECT)$/.test(a.tagName)) return true;
+    var fields = document.querySelectorAll("textarea, input[type=text], input:not([type])");
+    for (var i = 0; i < fields.length; i++) {
+      if ((fields[i].value || "").trim() !== "") return true;
+    }
+    return false;
+  }
+  setInterval(function () {
+    if (!hasUnsavedInput()) location.reload();
+  }, INTERVAL);
+})();