🎨 Palette: Add tooltip to Transaction Cost

.Jules/palette.md

@@ -0,0 +1,3 @@
+## 2024-10-24 - Add help tooltip for bps input
+**Learning:** Inputs involving statistical or financial parameters (e.g., quantiles, basis points) can be confusing without examples. Adding concrete examples (e.g., "10 bps = 0.10%") improves clarity and user confidence.
+**Action:** Always include a `help` tooltip with a concrete example for any input field that uses financial jargon or statistical units like basis points.

src/dashboard.py

@@ -190,7 +190,15 @@ def get_cache_key(*args) -> str:
 
     if mode == "Single-Asset":
         st.subheader("5. Backtest Settings")
-        bt_cost = st.number_input("Transaction Cost (bps)", value=DEFAULT_COST_BPS, step=1) / 10000
+        bt_cost = (
+            st.number_input(
+                "Transaction Cost (bps)",
+                value=DEFAULT_COST_BPS,
+                step=1,
+                help="10 bps = 0.10%",
+            )
+            / 10000
+        )
         allow_short = st.checkbox("Allow Short Selling?", value=False)
     else:
         st.subheader("5. Alert Thresholds")