softphone: People panel with presence, click-to-call

People lists every extension with its status dot and a search box: a
right-hand column on wide screens, /me/people on small ones. Call uses the
browser softphone when it's on, else POST /api/me/click-to-call, which
originates to the user's desk phone first (409 if none is registered).
During a call: Transfer (blind), Talk first (consult), or drag the call
card onto a person; a held call card offers Complete transfer whenever
another call is active. useSoftphone moved to its own module.

e2e m5-t3: the dot changes ~30 ms after Asterisk's hint; click-to-call
rings 174 before 172. cdp click() takes a scope (People also has
Call/Transfer buttons). trunk-test ignores the RTCP-at-teardown EPERM
error seen once.

Task: M5-T3

apps/api/test/me-voicemail.test.ts

@@ -77,7 +77,7 @@ describe.skipIf(!hasTestDb)('/api/me/voicemail and greetings', () => {
     // Asterisk's side of VoicemailMove/VoicemailRemove, on disk (one message, msg0000).
     t.ami.action = async function (f: Record<string, string>) {
       this.actions.push(f);
-      const from = join(box(), f.Folder!, 'msg0000');
+      const from = join(box(), f.Folder ?? '', 'msg0000');
       if (f.Action === 'VoicemailMove') {
         mkdirSync(join(box(), f.ToFolder!), { recursive: true });
         for (const x of ['wav', 'txt'])
@@ -144,6 +144,24 @@ describe.skipIf(!hasTestDb)('/api/me/voicemail and greetings', () => {
     t.ami.connected = true;
   });
 
+  it('click-to-call: rings my desk phone first, then dials the number', async () => {
+    expect((await dan('POST', '/api/me/click-to-call', { number: '172' })).statusCode).toBe(409);
+    t.live.deskOnline = (n) => n === '101';
+    const r = await dan('POST', '/api/me/click-to-call', { number: '(312) 555-1234' });
+    expect(r.statusCode).toBe(200);
+    expect(t.ami.actions.at(-1)).toEqual({
+      Action: 'Originate',
+      Channel: 'PJSIP/101',
+      Context: 'sp-from-ext',
+      Exten: '3125551234',
+      Priority: '1',
+      CallerID: '"3125551234" <101>',
+      Async: 'true',
+    });
+    expect((await dan('POST', '/api/me/click-to-call', { number: 'abc' })).statusCode).toBe(400);
+    expect((await eve('POST', '/api/me/click-to-call', { number: '172' })).statusCode).toBe(404);
+  });
+
   it('webrtc: creds for <ext>-web with ICE servers; 404 without an extension', async () => {
     await setSetting(t.db, 'network.stunServer', 'stun.example.org:3478');
     const r = await dan('GET', '/api/me/webrtc');