Fix all broken emoji/unicode characters in sidebar and UI

app.py

@@ -362,7 +362,7 @@ def is_scraper_running(slot_idx: int) -> bool:
 st.set_page_config(
     page_title="LivePulse",
     layout="wide",
-    page_icon="??",
+    page_icon="\U0001F4E1",
     initial_sidebar_state="expanded"
 )
 
@@ -629,7 +629,7 @@ def plotly_layout(height=280):
 
 def csv_download(df_export, label, filename):
     csv = df_export.to_csv(index=False).encode("utf-8")
-    st.download_button(label=f"? {label}", data=csv,
+    st.download_button(label=f"\u2b07 {label}", data=csv,
                        file_name=filename, mime="text/csv", key=filename)
 
 
@@ -655,17 +655,17 @@ def compute_velocity(df_all_json: str, window: int = 20) -> dict:
     sentiments = [m.get("sentiment", "Neutral") for m in _json.loads(df_all_json)]
     n = len(sentiments)
     if n < window * 2:
-        return {"direction": "?", "delta": 0.0, "label": "Stable", "color": "#eab308"}
+        return {"direction": "\u2192", "delta": 0.0, "label": "Stable", "color": "#eab308"}
     recent = sentiments[-window:]
     prev   = sentiments[-window*2:-window]
     r_pos  = sum(1 for s in recent if s == "Positive") / window
     p_pos  = sum(1 for s in prev   if s == "Positive") / window
     delta  = r_pos - p_pos
     if delta > 0.08:
-        return {"direction": "?", "delta": delta, "label": "Rising",  "color": "#22c55e"}
+        return {"direction": "\u2191", "delta": delta, "label": "Rising",  "color": "#22c55e"}
     elif delta < -0.08:
-        return {"direction": "?", "delta": delta, "label": "Falling", "color": "#ef4444"}
-    return {"direction": "?", "delta": delta, "label": "Stable", "color": "#eab308"}
+        return {"direction": "\u2193", "delta": delta, "label": "Falling", "color": "#ef4444"}
+    return {"direction": "\u2192", "delta": delta, "label": "Stable", "color": "#eab308"}
 
 
 @st.cache_data(ttl=10, show_spinner=False)
@@ -733,9 +733,9 @@ def compute_engagement(all_data_json: str, window: int = 50) -> dict:
     rate_norm = min(rate / 60, 1.0)
     score = round((rate_norm * 0.4 + pos_ratio * 0.4 + q_density * 0.2) * 100)
 
-    if score >= 70:   grade = "?? High"
-    elif score >= 40: grade = "? Medium"
-    else:             grade = "?? Low"
+    if score >= 70:   grade = "\U0001f525 High"
+    elif score >= 40: grade = "\u26a1 Medium"
+    else:             grade = "\U0001f4a4 Low"
 
     return {"score": score, "rate": rate, "pos_ratio": pos_ratio, "q_density": q_density, "grade": grade}
 
@@ -937,7 +937,7 @@ if "streams" not in st.session_state:
 with st.sidebar:
     st.markdown(
         '<div style="padding:12px 0 20px;">'
-        '<div style="font-size:1.35rem;font-weight:800;color:var(--text-1);letter-spacing:-0.02em;">?? LivePulse</div>'
+        '<div style="font-size:1.35rem;font-weight:800;color:var(--text-1);letter-spacing:-0.02em;">\U0001F4E1 LivePulse</div>'
         '<div style="font-size:0.75rem;color:var(--text-3);margin-top:2px;">YouTube Chat Analytics</div>'
         '</div>', unsafe_allow_html=True
     )
@@ -989,7 +989,7 @@ with st.sidebar:
 
         sc1, sc2 = st.columns(2)
         with sc1:
-            if st.button("? Start", key=f"start_{idx}"):
+            if st.button("\u25b6 Start", key=f"start_{idx}"):
                 vid  = extract_video_id(st.session_state[vid_skey])
                 rkey = st.session_state[rkey_skey].strip() or f"chat_messages_{label.lower()}"
                 if vid:
@@ -1006,11 +1006,11 @@ with st.sidebar:
                         else:
                             _META.pop("video_title", None)
                         st.session_state.alert_dismissed = False
-                    st.success(f"Stream {label} started ? `{rkey}`")
+                    st.success(f"Stream {label} started -> `{rkey}`")
                 else:
                     st.error("Invalid video ID or URL")
         with sc2:
-            if st.button("? Stop", key=f"stop_{idx}"):
+            if st.button("\u23f9 Stop", key=f"stop_{idx}"):
                 if is_scraper_running(idx):
                     stop_scraper(idx)
                     st.session_state.streams[idx]["proc"] = None
@@ -1021,7 +1021,7 @@ with st.sidebar:
         running   = is_scraper_running(idx)
         dot_color = "#22c55e" if running else "#ef4444"
         status    = "running" if running else "stopped"
-        st.markdown(f'<div style="font-size:0.72rem;color:{dot_color};margin-bottom:4px;">? {status}</div>', unsafe_allow_html=True)
+        st.markdown(f'<div style="font-size:0.72rem;color:{dot_color};margin-bottom:4px;">\u25cf {status}</div>', unsafe_allow_html=True)
 
         # Show scraper error if any (only for stream A)
         if idx == 0 and _META.get("scraper_error"):
@@ -1056,7 +1056,7 @@ with st.sidebar:
     st.markdown('<p style="font-size:0.68rem;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:0.1em;margin-bottom:8px;">Pinned Messages</p>', unsafe_allow_html=True)
     pin_count = len(st.session_state.pinned_messages)
     st.markdown(f'<div style="font-size:0.78rem;color:var(--text-3);">{pin_count} message{"s" if pin_count != 1 else ""} pinned</div>', unsafe_allow_html=True)
-    if pin_count > 0 and st.button("?? Clear pins"):
+    if pin_count > 0 and st.button("\U0001f5d1 Clear pins"):
         st.session_state.pinned_messages = []
         st.rerun()
     st.divider()
@@ -1081,7 +1081,7 @@ with st.sidebar:
                 _fname = f"livepulse_{_rkey}_{_ts}.csv"
                 _csv_bytes = _dl_df.to_csv(index=False).encode("utf-8")
                 st.download_button(
-                    label=f"? {_slabel} ({len(_dl_rows)} msgs)",
+                    label=f"?"\u2b07 {_slabel} ({len(_dl_rows)} msgs)",
                     data=_csv_bytes,
                     file_name=_fname,
                     mime="text/csv",
@@ -1095,7 +1095,7 @@ with st.sidebar:
 
     # -- Danger Zone --
     st.markdown('<p style="font-size:0.68rem;font-weight:700;color:#ef4444;text-transform:uppercase;letter-spacing:0.1em;margin-bottom:8px;">Danger Zone</p>', unsafe_allow_html=True)
-    if st.button("?? Clear all data"):
+    if st.button("\U0001f5d1 Clear all data"):
         for s in st.session_state.streams:
             store_delete(s["redis_key"])
         st.session_state.pinned_messages = []
@@ -1105,7 +1105,7 @@ with st.sidebar:
     st.markdown(
         '<div style="font-size:0.72rem;color:var(--text-3);text-align:center;line-height:1.6;">'
         'Theme follows Streamlit settings<br>'
-        '<span style="font-size:0.65rem;">? ? Settings ? Theme</span>'
+        '<span style="font-size:0.65rem;">\u2630 \u2192 Settings \u2192 Theme</span>'
         '</div>', unsafe_allow_html=True
     )