fix(voice): direction-aware copy for voice call bubble

Outbound IN_PROGRESS no longer claims "They answered" — the backend can
flip in_progress before the contact actually picks up (Twilio agent-join
flow), so the label "Call in progress" stands on its own. Outbound
no_answer now reads "Contact didn't pick up" instead of the inbound
"Missed call / No answer" framing, and outbound ringing shows
"Calling…" instead of "Not answered yet".

app/javascript/dashboard/i18n/locale/en/conversation.json

@@ -79,9 +79,13 @@
       "OUTGOING_CALL": "Outgoing call",
       "CALL_IN_PROGRESS": "Call in progress",
       "NO_ANSWER": "No answer",
+      "NO_ANSWER_OUTBOUND_LABEL": "No answer",
+      "NO_ANSWER_OUTBOUND_SUBTEXT": "Contact didn't pick up",
       "MISSED_CALL": "Missed call",
+      "MISSED_CALL_INBOUND_SUBTEXT": "No agent picked up",
       "CALL_ENDED": "Call ended",
       "NOT_ANSWERED_YET": "Not answered yet",
+      "CALLING": "Calling…",
       "THEY_ANSWERED": "They answered",
       "YOU_ANSWERED": "You answered",
       "AGENT_ANSWERED": "{agentName} answered",