Optimize layout proportions: reduce gap between chart and buttons

- Moved buttons from y=0.34 to y=0.37 for closer proximity to chart
- Adjusted chart to [0.08, 0.42, 0.88, 0.53] for better chart-to-button ratio
- Enhanced log panel to [0.08, 0.02, 0.88, 0.32] for optimal display area
- Maintains clear separation while eliminating excessive white space

Improved layout structure:
- Chart Title (top)
- Main Chart (y: 0.42-0.95) - larger chart area
- X-axis Labels (y: ~0.39-0.42) - proper space
- Time Window Buttons (y: 0.37) - minimal but clear gap
- Log Panel (y: 0.02-0.34) - enhanced display

This achieves optimal balance between visual separation and space efficiency.

Author: Radar Distance Monitor

src/radar_distance_monitor.py

@@ -274,24 +274,24 @@ def __init__(self, collectors: List[RadarDataCollector], max_points: int = 100):
 
         # Set up the plot with an additional text area for recent logs
         self.fig = plt.figure(figsize=(12, 8))
-        # Main chart axes (normal chart area with space for x-axis labels)
-        self.ax = self.fig.add_axes([0.08, 0.50, 0.88, 0.45])
+        # Main chart axes (optimized chart area with space for x-axis labels)
+        self.ax = self.fig.add_axes([0.08, 0.42, 0.88, 0.53])
         # Log panel axes (lower area, positioned below button area)
-        self.log_ax = self.fig.add_axes([0.08, 0.02, 0.88, 0.30])
+        self.log_ax = self.fig.add_axes([0.08, 0.02, 0.88, 0.32])
         self.log_ax.axis('off')
         # Increase font size for distance viewing (half previous), and nudge one line down
         self.log_text = self.log_ax.text(0.01, 0.90, "", va='top', ha='left', family='monospace', fontsize=22)
         self.max_log_lines = 8  # retained but unused for now; kept for future toggles
         # Per-host latest log line (timestamp, tag, stream, line)
         self.latest_logs = {collector.host_id: None for collector in collectors}
 
-        # Add time window selection buttons (positioned in dedicated space between chart and log panel)
+        # Add time window selection buttons (positioned closer to chart with minimal gap)
         self.time_window_buttons = []
         button_width = 0.08
         button_height = 0.025
         button_spacing = 0.02
         start_x = 0.08
-        button_y = 0.34  # Positioned in dedicated button zone, well below chart
+        button_y = 0.37  # Positioned closer to chart with minimal but clear separation
 
         from matplotlib.widgets import Button