fix(battlecard): correct font size to 9pt minimum and remove unused imports

src/battlecards/mini_charts.py

@@ -3,7 +3,6 @@ import argparse
 import matplotlib
 matplotlib.use("Agg")
 import matplotlib.pyplot as plt
-import matplotlib.patches as mpatches
 from matplotlib.path import Path as MPLPath
 # Python 3.14 matplotlib patch (required)
 _orig = MPLPath.__deepcopy__
@@ -18,17 +17,14 @@ from pathlib import Path
 
 from src.utils.styling import (
     get_theme,
-    EXPORT_DPI,
     BUBBLE_ZONE,
     AI_SPEND,
     REVENUE,
     WARNING_ZONE,
-    NORMAL_ZONE,
     GRAY_DARK,
     GRAY_MEDIUM,
     WHITE,
 )
-from src.utils.export import save_chart
 
 MINI_FIGURE_SIZE = (5, 3)
 MINI_DPI = 300
@@ -209,7 +205,7 @@ class MiniChartEngine:
                 -0.55,
                 context_text,
                 ha="center",
-                fontsize=MIN_LABEL_FONT_SIZE - 1,
+                fontsize=MIN_LABEL_FONT_SIZE,
                 color=GRAY_MEDIUM,
                 style="italic",
             )