fix: Rich-Markup-Fehler bei leeren Styles + Telefonnummer-Normalisierung

- _render_message: leeren style-Tag vermieden (MarkupError bei inbound-Msgs)
- Nachrichtentext: eckige Klammern werden escaped (kein Markup-Injection)
- get_by_phone: sucht +49xxx und 49xxx gleichzeitig (Green API liefert ohne +)

tui/screens/main_screen.py

@@ -143,11 +143,11 @@ class MainScreen(Screen):
         direction = msg.get("direction", "outbound")
         direction_prefix = "▶ " if direction == "outbound" else "◀ "
         status_suffix = " ✗" if msg.get("status") == "failed" else ""
-        style = "dim" if direction == "outbound" else ""
-        text = msg.get("text", "")
-        log.write(
-            f"[dim]{ts}[/dim] [{style}]{direction_prefix}{text}{status_suffix}[/{style}]"
-        )
+        text = msg.get("text", "").replace("[", "\\[")
+        if direction == "outbound":
+            log.write(f"[dim]{ts}[/dim] [dim]{direction_prefix}{text}{status_suffix}[/dim]")
+        else:
+            log.write(f"[dim]{ts}[/dim] {direction_prefix}{text}{status_suffix}")
 
     # ── Background-Polling ─────────────────────────────────────────────────────