Move texture loading to initialization, remove per-frame calls

docs/planning/rendering-cleanup-plan.md

@@ -17,7 +17,7 @@ The renderer has several inefficiencies:
 - Create this plan document in docs/planning/
 - **PAUSE** for user review
 
-### Step 2: Move Texture Loading to Initialization
+### Step 2: Move Texture Loading to Initialization [COMPLETED]
 - Modify `init_renderer()` or `setup_camera()` to call `ensure_textures_loaded()` once
 - Remove `ensure_textures_loaded()` calls from:
   - `render_spacecraft_screen_space()` (renderer.cpp:385)

src/renderer.cpp

@@ -179,6 +179,8 @@ void setup_camera(RenderState* render_state) {
     for (int i = 0; i < 6; i++) {
         render_state->maneuver_textures[i] = (Texture2D){0, 0, 0, 0, 0};
     }
+
+    ensure_textures_loaded(render_state);
 }
 
 static bool has_target_changed(RenderState* render_state) {
@@ -382,8 +384,6 @@ void render_spacecraft_screen_space(Spacecraft* craft, RenderState* render_state
         return;
     }
 
-    ensure_textures_loaded(render_state);
-
     float screen_size = 40.0f;
     Color spacecraft_color = { 0, 255, 255, 255 };
     float angle = calculate_spacecraft_angle(craft->local_velocity, render_state->camera);
@@ -417,8 +417,6 @@ void render_maneuver_marker_screen_space(Spacecraft* craft, Maneuver* maneuver,
         return;
     }
 
-    ensure_textures_loaded(render_state);
-
     float screen_size = (float)(maneuver->delta_v / 50.0f);
     if (screen_size < 20.0f) screen_size = 20.0f;
     if (screen_size > 60.0f) screen_size = 60.0f;