Fix weight chart to show only raw data points

- Change from lines to markers mode for weight and body fat
- Remove connectgaps to prevent weird lines across missing data
- Show clean individual data points instead of connected lines
- Larger markers for better visibility

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: nikolay-e

app.py

@@ -879,7 +879,9 @@ def update_chart_date_range(fig, start_date, end_date):
                 x=data["weight"]["date"],
                 y=data["weight"]["weight_kg"],
                 name="Weight (kg)",
-                line={"color": "crimson", "width": 3},
+                mode="markers",
+                marker={"color": "crimson", "size": 8},
+                connectgaps=False,
             ),
             secondary_y=False,
         )
@@ -900,7 +902,9 @@ def update_chart_date_range(fig, start_date, end_date):
                     x=data["weight"]["date"],
                     y=data["weight"]["body_fat_pct"],
                     name="Body Fat %",
-                    line={"color": "dodgerblue", "width": 2},
+                    mode="markers",
+                    marker={"color": "dodgerblue", "size": 6},
+                    connectgaps=False,
                 ),
                 secondary_y=True,
             )