refactor: replace Jinja templates with static frontend pages

webui/static/hoover/helpers.js

@@ -0,0 +1,51 @@
+/**
+ * Hoover — helpers.js
+ *
+ * Shared utilities: text escaping, attribute escaping, DOM value helpers,
+ * zone parsing, form utilities.
+ */
+
+/**
+ * Escape text for safe HTML output.
+ * Appends the string to a temporary div and reads innerHTML,
+ * which safely escapes all HTML special characters.
+ */
+export function esc(s) {
+    const d = document.createElement('div');
+    d.append(String(s ?? ''));
+    return d.innerHTML;
+}
+
+/**
+ * Escape a string for safe use in HTML attributes.
+ */
+export function att_esc(s) {
+    return String(s ?? '')
+        .replace(/&/g, '&')
+        .replace(/"/g, '"')
+        .replace(/'/g, ''')
+        .replace(/</g, '&lt;')
+        .replace(/>/g, '&gt;');
+}
+
+/**
+ * URL-encode a string.
+ */
+export const enc = encodeURIComponent;
+
+/**
+ * Get the value of a DOM element by ID.
+ */
+export function $val(id) {
+    return document.getElementById(id)?.value;
+}
+
+/**
+ * Parse zone data from various API response shapes into a flat string array.
+ */
+export function parseZones(data) {
+    let z = data?.active || data?.zones || [];
+    if (typeof z === 'object' && !Array.isArray(z))
+        z = Object.values(z).map(i => i?.name || i);
+    return Array.isArray(z) ? z : [];
+}