Fix compiler warnings: remove unused variables, increase buffer size

src/mission_planning.cpp

@@ -21,7 +21,6 @@ TransferParameters calculate_hohmann_transfer(double r_departure, double r_arriv
 
     params.delta_v_capture = 0.0;
 
-    double departure_period = 2.0 * M_PI * sqrt(pow(r_departure, 3) / (G * central_mass));
     double arrival_period = 2.0 * M_PI * sqrt(pow(r_arrival, 3) / (G * central_mass));
     params.phase_angle_deg = calculate_required_phase_angle(params.transfer_time, arrival_period);
 
@@ -112,7 +111,6 @@ int spawn_spacecraft_on_transfer(SimulationState* sim, int departure_idx,
     }
 
     CelestialBody* departure = &sim->bodies[departure_idx];
-    CelestialBody* sun = &sim->bodies[0];
 
     CelestialBody spacecraft;
     spacecraft.name[0] = 'S';

src/renderer.cpp

@@ -414,7 +414,7 @@ void render_info(SimulationState* sim) {
 
     // Prepare info text
     char info_text[1024];
-    char temp_buffer[256];
+    char temp_buffer[512];
 
     snprintf(info_text, sizeof(info_text), "Orbital Mechanics Simulation\n\n");