Extract child indicator constants from magic numbers

docs/planning/rendering-cleanup-plan.md

@@ -70,7 +70,7 @@ Remove all spacecraft texture-related code:
 - Replace magic numbers in all UI rendering functions
 - **PAUSE** for user review
 
-### Step 7: Extract Child Indicator Constants
+### Step 7: Extract Child Indicator Constants [COMPLETED]
 - Add constants to renderer.cpp:
   - `CHILD_INDICATOR_RADIUS = 20.0f`
   - `CHILD_INDICATOR_FONT_SIZE = 10`

src/renderer.cpp

@@ -29,6 +29,10 @@
 #define MIN_DISTANCE_SPACECRAFT_PARENT_RADIUS_MULT 0.1f
 #define CAMERA_NEAR_CULL_DISTANCE 0.05f
 
+// Child indicator constants
+#define CHILD_INDICATOR_RADIUS 20.0f
+#define CHILD_INDICATOR_FONT_SIZE 10
+
 // Zoom direction enumeration for improved readability
 enum ZoomDirection {
     ZOOM_IN = 1,
@@ -47,11 +51,9 @@ enum ZoomDirection {
 static Vector3 sim_to_render(Vec3 pos, double scale);
 
 static void draw_child_indicator(Vector2 screen_pos, const char* name, Color color) {
-    const float radius = 20.0f;
-
-    DrawCircleLinesV(screen_pos, radius, color);
+    DrawCircleLinesV(screen_pos, CHILD_INDICATOR_RADIUS, color);
 
-    int font_size = 10;
+    int font_size = CHILD_INDICATOR_FONT_SIZE;
     int text_width = MeasureText(name, font_size);
     Vector2 text_pos = {screen_pos.x - text_width/2, screen_pos.y - font_size/2};
     DrawText(name, (int)text_pos.x, (int)text_pos.y, font_size, color);