v3.23.4: the event form's numeric option values (v3.22.0 regression)

esc() is string-only, and most EVENT_FORMS option values are numbers
({v:0,l:'Normal service'}, the ACCESSTECH list, ...): the shared event-form
renderer escaped them with esc(o.v), so opening any such event form threw
'str.replace is not a function' - in the Phone tab (pysimEventSendForm) and
the test-script step editor alike (both call the same builder).  Introduced
with v3.22.0, when the event action started using the Simulator's forms.

Option values (and the data-gr group) are stringified before escaping, the
pattern the sibling option builder already used; the emitted DOM values are
unchanged ("0", "10").

Test: event_forms.test.js renders every event form (Phone and step-editor
variants) and asserts a numeric option prefills selected - verified to fail
on the pre-fix code.  848 frontend + 830 Python; sw cache simple-v417.

frontend/tests/event_forms.test.js

@@ -38,6 +38,8 @@ eval(extractBlock('const EVENT_INNER_MAX = ', 'function pysimEventSendForm').rep
 eval(extractFunc(html, 'eventFieldsForRelease'));
 eval(extractFunc(html, 'encPlmn'));
 eval(extractFunc(html, 'bytesToHex'));
+eval(extractFunc(html, 'esc'));
+eval(extractFunc(html, 'eventFormFieldsHtml'));
 
 test('CMD_NAMES decodes timer management and the BIP commands', () => {
 	assert.strictEqual(CMD_NAMES['01'], 'REFRESH');
@@ -344,3 +346,32 @@ test('the shared event vectors match the PWA builders', () => {
 			'scts ' + JSON.stringify(v));
 	}
 });
+
+test('every event form renders - numeric option values are stringified (v3.23.4)', () => {
+	// esc() is string-only and most EVENT_FORMS option values are numbers
+	// (e.g. {v:0,l:'Normal service'} and the ACCESSTECH list): rendering the
+	// form with esc(o.v) crashed with 'str.replace is not a function' for the
+	// Phone tab and the test-script step editor alike (v3.22.0 regression).
+	globalThis.t = s => s;
+	const bad = [];
+	for (const [ev, cfg] of Object.entries(EVENT_FORMS)) {
+		if (!cfg) continue;   // the unimplemented events carry a null form
+		for (const withOnchange of [true, false]) {
+			try {
+				eventFormFieldsHtml(cfg, cfg.fields, {}, 'x-', withOnchange);
+			} catch (e) {
+				bad.push(ev + (withOnchange ? '/phone' : '/step') + ': ' + e.message);
+			}
+		}
+	}
+	assert.deepStrictEqual(bad, [], 'every event form must render');
+	// a numeric option value lands as its string form and prefills selected
+	const cfg = EVENT_FORMS[0x00];
+	const sel = cfg.fields.find(f => f.type === 'select' && f.opts.some(o => typeof o.v === 'number'));
+	assert.ok(sel, 'a numeric-option select must exist');
+	const num = sel.opts.find(o => typeof o.v === 'number');
+	const out = eventFormFieldsHtml(cfg, cfg.fields, {[sel.id]: num.v}, 'x-', true);
+	assert.ok(out.includes('value="' + String(num.v) + '"'), out);
+	assert.ok(out.includes('value="' + String(num.v) + '" selected'), out);
+	delete globalThis.t;
+});