fix(whatsapp): make every silent disposition observable, stop pure silence for linked senders (#1563)

* fix(whatsapp): make every silent disposition observable, stop pure silence for linked senders (#1552)

Silence was a legitimate outcome in seven places and none left a trace a
support question could be answered from. Now:

- Unknown-sender declines (over quota, quota RPC failure, greeting
  throttle) persist content-free trace rows: wamid, phone hash, type,
  disposition. No body, media, raw payload, or profile name; capped at
  20 rows per hash and day; deleted by the existing 30-day retention.
  The wamid dedupe also stops redelivered bad-code/greeting messages
  from earning a second reply.
- Linked-sender deliberate silences (muted, stale tap, ignorable type)
  record their reason on the skipped row.
- Non-policy silences reply: a row missing its media reference sends
  M18 through the link's reply address, a link revoked between arrival
  and processing sends the M1 unlinked copy (greeting-throttled).
- Outbound rows keep WHY a send failed (Graph error detail), and Meta
  'failed' delivery statuses store their error code and title.
- The WhatsApp settings panel shows the last inbound event (closed
  enum, server-derived) and warns when the latest reply never left.

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

* test(whatsapp): include errorDetail in typed sendText mock results

SendTextResult gained errorDetail; vi.mocked call sites must match the
widened type or they raise fresh tsc errors over the repo baseline.

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

* fix(whatsapp): review fixes: fail-closed greeting throttle, cap only declined traces

From CodeRabbit's pass on #1563:
- greetingThrottled fails closed when the throttle window cannot be
  read, matching the unknown-sender quota's stance.
- The decline-trace day cap applies only to 'skipped' rows (the one
  unbounded path); 'done' traces always insert so the wamid dedupe
  keeps preventing duplicate M1/M2 replies even past the cap. Their
  volume is already bounded upstream by the greeting throttle and the
  pre-binding quota.
- company-question test mocks match the widened SendTextResult.

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

---------

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

components/extensions/general/WhatsAppLinkPanel.tsx

@@ -14,9 +14,11 @@ import { useCallback, useEffect, useState } from 'react'
 import { useTranslations } from 'next-intl'
 import { Loader2, ExternalLink } from 'lucide-react'
 import { WhatsAppMark } from '@/components/extensions/general/WhatsAppMark'
+import { AttnLine } from '@/components/ui/attn-line'
 import { Button } from '@/components/ui/button'
 import { useToast } from '@/components/ui/use-toast'
 import { useCompany } from '@/contexts/CompanyContext'
+import { useFormat } from '@/lib/hooks/use-format'
 import {
   SettingsGroup,
   SettingsRow,
@@ -26,11 +28,28 @@ import {
 
 const BASE = '/api/extensions/ext/whatsapp-inbox'
 
+/** Closed enum from the server (lib/last-event.ts); translated here. */
+const LAST_EVENT_KINDS = new Set([
+  'filed',
+  'handled',
+  'processing',
+  'awaiting_company',
+  'duplicate',
+  'rate_limited',
+  'unsupported',
+  'muted',
+  'declined',
+  'failed',
+])
+
 interface LinkStatus {
   linked: boolean
   phoneMasked?: string
   defaultCompanyId?: string | null
   muted?: boolean
+  lastInboundAt?: string | null
+  lastInboundEvent?: string | null
+  lastReplyFailed?: boolean
 }
 
 interface MintedCode {
@@ -43,6 +62,7 @@ export function WhatsAppLinkPanel() {
   const t = useTranslations('settings_whatsapp')
   const { toast } = useToast()
   const { companies } = useCompany()
+  const { locale, formatDateLong } = useFormat()
 
   const [isLoading, setIsLoading] = useState(true)
   const [loadFailed, setLoadFailed] = useState(false)
@@ -167,6 +187,27 @@ export function WhatsAppLinkPanel() {
           </SettingsRow>
         ) : null}
 
+        {status.lastInboundAt ? (
+          <SettingsRow label={t('last_event_label')}>
+            <div className="space-y-1">
+              <span className="text-sm">
+                {formatDateLong(status.lastInboundAt)}{' '}
+                {new Date(status.lastInboundAt).toLocaleTimeString(
+                  locale === 'en' ? 'en-GB' : 'sv-SE',
+                  { hour: '2-digit', minute: '2-digit' },
+                )}
+                {' · '}
+                {t(
+                  status.lastInboundEvent && LAST_EVENT_KINDS.has(status.lastInboundEvent)
+                    ? `last_event_${status.lastInboundEvent}`
+                    : 'last_event_handled',
+                )}
+              </span>
+              {status.lastReplyFailed ? <AttnLine>{t('last_reply_failed')}</AttnLine> : null}
+            </div>
+          </SettingsRow>
+        ) : null}
+
         <SettingsRow label={t('default_company_label')} help={t('default_company_help')}>
           <SettingsSelect
             aria-label={t('default_company_label')}