Drop redundant "CTA Campaign" prefix from the phase title

The Campaign dropdown already says "CTA Campaign" right next to it -
repeating it in the header buried the thing that actually matters,
the timeframe. Title now leads with the date range itself (e.g.
"Nov 3 - Nov 26 (Failure Analysis)").

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

app.py

@@ -4527,7 +4527,7 @@ def _render_reports_tab(month_value):
         # treatment "End of Campaign" itself got before it was built out.
         period_label = next((lbl for v, lbl in _REPORTS_CAMPAIGNS["cta-campaign"]["periods"]
                               if v == month_value), month_value)
-        title = html.H3(f"CTA Campaign — {period_label}",
+        title = html.H3(period_label,
                          style={"color": "#1b3a5c", "marginBottom": "0", "fontWeight": "700",
                                 "fontSize": "2rem", "whiteSpace": "nowrap"})
         placeholder = dbc.Alert(