fix: Seaca push uses same lifecycle text as Telegram (0.9.11)

Reuse telegram templates for FCM title/body so agent start/restart
reasons reach mobile without Seaca app changes.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/telegram_templates.py

@@ -506,6 +506,43 @@ def format_event_telegram_html(event: Event) -> str:
     return _append_event_source(_format_event_body_html(event), event)
 
 
+_TELEGRAM_INLINE_TAGS = re.compile(r"</?(?:b|i|u|s|code|pre|tg-spoiler)(\s[^>]*)?>", re.I)
+_TELEGRAM_ANCHOR_OPEN = re.compile(r"<a\b[^>]*>", re.I)
+_TELEGRAM_ANCHOR_CLOSE = re.compile(r"</a>", re.I)
+
+_MOBILE_PUSH_BODY_MAX = 3500
+
+
+def telegram_html_to_plaintext(text: str) -> str:
+    """Plain text for Seaca push from the same HTML templates as Telegram."""
+    out = sanitize_telegram_html(text)
+    out = _TELEGRAM_INLINE_TAGS.sub("", out)
+    out = _TELEGRAM_ANCHOR_OPEN.sub("", out)
+    out = _TELEGRAM_ANCHOR_CLOSE.sub("", out)
+    out = html.unescape(out)
+    out = re.sub(r"\n{3,}", "\n\n", out)
+    return out.strip()
+
+
+def format_event_mobile_push(event: Event) -> tuple[str, str]:
+    """Title + body for FCM data payload (mirrors Telegram wording)."""
+    plain = telegram_html_to_plaintext(format_event_telegram_html(event))
+    lines = [line.strip() for line in plain.split("\n") if line.strip()]
+    if lines:
+        title = lines[0]
+        body = "\n".join(lines[1:]).strip()
+        if not body:
+            body = (event.summary or "").strip()
+    else:
+        title = f"[{event.severity}] {event.title}"
+        body = (event.summary or "").strip()
+    if len(title) > 120:
+        title = title[:117] + "…"
+    if len(body) > _MOBILE_PUSH_BODY_MAX:
+        body = body[: _MOBILE_PUSH_BODY_MAX - 1] + "…"
+    return title, body
+
+
 def _format_rdg_html(event: Event) -> str:
     details = _details_dict(event)
     if event.type.endswith(".success"):