Adjust plotting figure sizes and docs whitespace

Remove hardcoded figure sizes and DPI in plotting routines and tweak subplot width ratios for improved layout. Changes: in src/digiqual/plotting.py removed figsize=(8, 6) from plot_signal_model and plot_pod_curve and removed an inline debug comment on the xlabel; in src/digiqual/pod.py reduced the overall figsize and adjusted width_ratios (2.5 -> 2.2) and removed the explicit dpi; in docs/qs_class.qmd added minor whitespace cleanup. These edits favor default Matplotlib sizing and slightly rebalance subplot proportions for more flexible rendering.

Author: JTyler13

docs/qs_class.qmd

@@ -121,6 +121,8 @@ _ = study.pod(poi_col="Length", threshold=18.0)
 # |   - "Signal Response Model (Physics)"
 # |   - "Probability of Detection Curve (Reliability)"
 # | layout-ncol: 1
+
+
 # 2. Visualize Results
 study.visualise()
 ```

src/digiqual/plotting.py

@@ -43,7 +43,7 @@ def plot_signal_model(
     ```
     """
     if ax is None:
-        fig, ax = plt.subplots(figsize=(8, 6))
+        fig, ax = plt.subplots()
 
     # 1. Plot Raw Data (Simulations)
     ax.scatter(X, y, alpha=0.5, c='grey', s=20, label='Simulation Data')
@@ -67,7 +67,7 @@ def plot_signal_model(
         )
 
     # Formatting
-    ax.set_xlabel(poi_name)  # <--- DYNAMIC LABEL
+    ax.set_xlabel(poi_name)
     ax.set_ylabel("Signal Response")
     ax.set_title(f"Signal Response Model ({poi_name})")
     ax.legend(loc='lower right')
@@ -114,7 +114,7 @@ def plot_pod_curve(
 
     """
     if ax is None:
-        fig, ax = plt.subplots(figsize=(8, 6))
+        fig, ax = plt.subplots()
 
     # 1. Plot the Main PoD Curve
     ax.plot(X_eval, pod_curve, color='black', linewidth=2, label='PoD Estimate')

src/digiqual/pod.py

@@ -127,7 +127,7 @@ def plot_model_selection(cv_scores: dict) -> Any:
 
     # 3. Create the Figure and subplots (Bar chart on left, Table on right)
     fig, (ax_plot, ax_table) = plt.subplots(
-        1, 2, figsize=(12, 5),dpi=300, gridspec_kw={'width_ratios': [2.5, 1]}
+        1, 2, figsize=(9, 5), gridspec_kw={'width_ratios': [2.2, 1]}
     )
 
     # --- Bar Chart (Left) ---