v3.18.0: the semantic event action for test scripts

The other-applet batch: a test script can send the common event downloads
semantically instead of raw hex.

- events.py: server-side mirrors of the PWA's event forms for Location status
  (0x03), Access technology change (0x0B), Network rejection (0x12 - the
  LA/RA/TA object selected by the registration group, the extended EMM cause
  and the extended information object) and Data connection status change
  (0x1D - status/type/TI plus the optional cause, host-clock 8.39 date-time,
  location information, access technology, APN and PDP/PDN/PDU type).  Fields
  are validated before the run (a bad value is a script error, not a step
  failure); `src` overrides the device-identities source (default terminal,
  matching the Phone forms).
- The engine gains the `event` action kind; the runner builds and sends it.
  The PWA's action-kind list stays in sync (drift-guarded - the guard itself
  caught its own regex bug on the first run).
- Byte parity: the vectors are generated from the PWA's own builders and
  pinned in tests/test_events.py; the frontend suites assert the same values.
  PLMN and SCTS helpers are mirrored too.
- The Phone tab's event form shows the built "Event data (hex)" (updated as
  the fields change), so every event without a builder can be used through
  the raw `envelope` action.
- The test-step editor offers the event select + a JSON fields textarea;
  malformed JSON refuses the save with a clear message.
- docs/test-scripts.md (the semantic-event table, an event example, the
  format stamp), docs/api.md and help EN/RU updated.

Tests: 812 frontend + 717 Python; sw cache simple-v381.

frontend/tests/testscripts.test.js

@@ -29,6 +29,7 @@ function extractFunc(src, name, asyncFn) {
 }
 
 eval(extractBlock('const CMD_NAMES = {', 'function cmdQualifierShort').replace(/^const /gm, 'var '));
+eval(extractBlock('const EVENT_NAMES = {', 'const REJECTION_CAUSES = [').replace(/^const /gm, 'var '));
 eval(extractBlock('const TEST_ACTION_KINDS = [', 'let _testScripts').replace(/^const /gm, 'var '));
 eval(extractFunc(html, 'testTemplate'));
 eval(extractFunc(html, 'testMenuSelectProblem'));
@@ -44,6 +45,7 @@ eval(extractFunc(html, 'testFormSelect'));
 eval(extractFunc(html, 'testStepRender'));
 eval(extractFunc(html, 'testRenderChecks'));
 eval(extractFunc(html, 'testStepCollect'));
+eval(extractFunc(html, 'testStepFormError'));
 eval(extractFunc(html, 'testWriteBackCounter'));
 eval(extractFunc(html, 'testRunPreset'));
 eval(extractFunc(html, 'testScriptsWriteback', true));
@@ -93,6 +95,12 @@ test('testScriptProblem accepts good scripts and names bad ones', () => {
 		params: {} }] }), /item id or text/);
 	assert.match(testScriptProblem({ steps: [{ type: 'action', kind: 'menu-select',
 		params: { item_id: 1, text: 'My menu' } }] }), /not both/);
+	assert.match(testScriptProblem({ steps: [{ type: 'action', kind: 'event',
+		params: {} }] }), /event is required/);
+	assert.match(testScriptProblem({ steps: [{ type: 'action', kind: 'event',
+		params: { event: '03', fields: [] } }] }), /object/);
+	assert.strictEqual(testScriptProblem({ steps: [{ type: 'action', kind: 'event',
+		params: { event: '03', fields: { status: 0 } } }] }), '');
 	assert.match(testScriptProblem({
 		steps: [{ type: 'action', kind: 'file-read', params: {} }] }), /file path/);
 	assert.match(testScriptProblem({ steps: [{ type: 'expect' }] }), /command is required/);
@@ -201,6 +209,27 @@ test('the menu-select editor collects the item id or the text', () => {
 	assert.deepStrictEqual(_testEditStep.params, { item_id: 3 });
 });
 
+test('the event step collects the type and the JSON fields', () => {
+	_testEditStep = { type: 'action', kind: 'event', params: {} };
+	_testEditChecks = [];
+	_testEditStepIndex = 0;
+	fakeForm({ 'test-step-kind': 'event', 'test-f-evtype': '12',
+		'test-f-evfields': '{"reg_type":"9","cause":"2"}',
+		'test-f-sw': '', 'test-f-cdata': '', 'test-f-fail': 'error' });
+	testStepCollect();
+	assert.deepStrictEqual(_testEditStep.params,
+		{ event: '12', fields: { reg_type: '9', cause: '2' } });
+	assert.strictEqual(_testEditStep._eventFieldsError, undefined);
+	// invalid JSON marks the form and the save refuses with a clear message
+	_testEditStep = { type: 'action', kind: 'event', params: {} };
+	fakeForm({ 'test-step-kind': 'event', 'test-f-evtype': '03',
+		'test-f-evfields': '{oops', 'test-f-sw': '', 'test-f-cdata': '', 'test-f-fail': 'error' });
+	assert.match(testStepFormError(), /JSON object/);
+	// the summary names the event
+	assert.strictEqual(testStepSummary({ type: 'action', kind: 'event',
+		params: { event: '03', fields: {} } }), 'EVENT Location status');
+});
+
 test('the STATUS step leaves the SW check to the server default', () => {
 	_testEditStep = { type: 'action', kind: 'status', params: { attempts: 5, interval_ms: 200 } };
 	fakeForm({ 'test-step-kind': 'status', 'test-f-attempts': '5', 'test-f-interval': '200',
@@ -227,6 +256,25 @@ test('the step form renders the chosen source and no pre-filled SW', () => {
 	assert.match(body, /id="test-f-sw" value=""/);
 });
 
+test('the event step form renders the event select and the JSON fields', () => {
+	const els = {
+		'test-step-modal': { classList: { add: () => {}, remove: () => {} } },
+		'test-step-title': {}, 'test-step-body': {},
+		'test-step-error': { classList: { add: () => {}, remove: () => {} } },
+	};
+	globalThis.document = { getElementById: id => els[id] || null };
+	_testEditStep = { type: 'action', kind: 'event',
+		params: { event: '12', fields: { reg_type: '9' } } };
+	_testEditChecks = [];
+	_testEditStepIndex = 0;
+	testStepRender();
+	const body = els['test-step-body'].innerHTML;
+	assert.match(body, /id="test-f-evtype"/);
+	assert.match(body, /<option value="12" selected>/);
+	assert.match(body, /id="test-f-evfields"/);
+	assert.ok(body.includes('{"reg_type":"9"}'), body);
+});
+
 test('hex fields strip mask wildcards, check values keep them', () => {
 	_testEditStep = { type: 'action', kind: 'apdu', params: {} };
 	fakeForm({ 'test-step-kind': 'apdu', 'test-f-apdu': '80E2??',