Validate Even Render Resolution Before Starting

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Localization/Locale/en.json

@@ -45,6 +45,7 @@
   "ui.render_config.random_seed": "Random Seed (Optional)",
   "ui.render_config.validation_title": "Invalid Settings",
   "ui.render_config.validation_error": "Please check your input values:\n- Width and Height must be integers > 0\n- Render FPS and Video FPS must be > 0\n- Delay After End must be >= 0",
+  "ui.render_config.validation_even_size": "Render width and height must be even numbers (current: {0} x {1}).",
   "ui.render_config.invalid_path": "Output directory path is invalid:\n{0}",
   "ui.render_config.planet_colors": "Planet Colors (Optional)",
   "ui.render_config.fire_planet": "Fire Planet",