leads: new phone number and an amoCRM lead on every call-button click

The published number becomes +7 927 789-60-71 across all four landings —
`contacts` in each `src/data/content.ts`, plus the fallback messages in the
lead endpoints and `src/lib/lead.ts` that spell it out when amoCRM is down.
The `legacy/` reference pages keep the old number: they are the visual
originals, not something that ships.

Tapping the phone button now also creates a lead. It cannot reuse the form
path: a click carries no name and no number, so `callClickSchema` in
`shared/lead.ts` validates the tracking data alone, `LeadService.submitCallClick`
creates a contactless lead tagged `клик по телефону`, and `AmoClient.createLead`
takes an optional `contactId` for it. The mapper's field/note split moved into
`collect()` so both lead kinds share it.

The browser fires this with `sendBeacon` (falling back to `fetch keepalive`),
because the same click hands the page to `tel:` and a plain fetch would be
cut off mid-flight. Duplicates are held down from both ends: one lead per
browser session on the client, four per IP per 30 minutes on the server.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

fitnes/src/lib/lead.ts

@@ -1,4 +1,10 @@
-import { utmKeys, type LeadFormId, type LeadInput, type LeadResponse } from '../../shared/lead'
+import {
+  utmKeys,
+  type CallClickInput,
+  type LeadFormId,
+  type LeadInput,
+  type LeadResponse,
+} from '../../shared/lead'
 
 const ENDPOINT = '/api/leads/fitness-centers'
 const DRAFT_KEY = 'exo_fitness_lead_draft'
@@ -46,7 +52,7 @@ export async function submitLead(form: LeadFormId, values: Omit<LeadInput, 'form
         error:
           body && !body.ok
             ? body.error
-            : 'Не удалось отправить форму автоматически. Данные сохранены в браузере — свяжитесь с нами по +7 939 717-80-80.',
+            : 'Не удалось отправить форму автоматически. Данные сохранены в браузере — свяжитесь с нами по +7 927 789-60-71.',
         fields: body && !body.ok ? body.fields : undefined,
       }
     }
@@ -61,7 +67,7 @@ export async function submitLead(form: LeadFormId, values: Omit<LeadInput, 'form
     return {
       ok: false,
       error:
-        'Не удалось отправить форму автоматически. Данные сохранены в браузере — свяжитесь с нами по +7 939 717-80-80.',
+        'Не удалось отправить форму автоматически. Данные сохранены в браузере — свяжитесь с нами по +7 927 789-60-71.',
     }
   }
 }
@@ -74,6 +80,76 @@ function saveDraft(payload: LeadInput) {
   }
 }
 
+/* -------------------------------------------------------------------------- */
+/* Клик по кнопке звонка                                                       */
+/* -------------------------------------------------------------------------- */
+
+const CALL_ENDPOINT = `${ENDPOINT}/call`
+const CALL_SENT_KEY = 'exo_fitness_call_click_sent'
+
+/** Session-scoped so a visitor who redials is still one lead, not three. */
+function callAlreadyReported(): boolean {
+  try {
+    return sessionStorage.getItem(CALL_SENT_KEY) === '1'
+  } catch {
+    // Private-mode browsers throw on access; one extra lead beats none.
+    return false
+  }
+}
+
+function markCallReported() {
+  try {
+    sessionStorage.setItem(CALL_SENT_KEY, '1')
+  } catch {
+    // See above.
+  }
+}
+
+/**
+ * Registers a tap on the phone button as an amoCRM lead.
+ *
+ * Fire-and-forget by necessity: the same click hands the page to `tel:`, so the
+ * request has to outlive the document. `sendBeacon` queues it in the browser
+ * process itself; `keepalive` is the fallback for the few browsers without it.
+ * Nothing here may throw or await — the dialler must open instantly.
+ */
+export function reportCallClick(): void {
+  if (callAlreadyReported()) return
+  markCallReported()
+
+  const payload: CallClickInput = {
+    page: window.location.pathname,
+    referrer: document.referrer || undefined,
+    utm: collectUtm(),
+  }
+
+  // A Blob, not a string: it is what gives the beacon its JSON content type.
+  const beacon = new Blob([JSON.stringify(payload)], { type: 'application/json' })
+
+  // sendBeacon returns false when the browser refuses to queue the payload, and
+  // a few throw instead of returning anything. Either way, fetch picks it up.
+  let queued = false
+  try {
+    queued = navigator.sendBeacon?.(CALL_ENDPOINT, beacon) ?? false
+  } catch {
+    queued = false
+  }
+
+  if (!queued) {
+    void fetch(CALL_ENDPOINT, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(payload),
+      keepalive: true,
+    }).catch((error: unknown) => {
+      console.warn('Call click endpoint error', error)
+    })
+  }
+
+  window.dataLayer = window.dataLayer ?? []
+  window.dataLayer.push({ event: 'fitness_call_click' })
+}
+
 declare global {
   interface Window {
     dataLayer?: Record<string, unknown>[]