[UI] Show All Trade Route Paths

Provides a set of UI options to display all trade routes connected to the player's civilization. A treat for scenery enthusiasts. You have built an empire that will last for eternity and fostered a civilization of magnificent wonders. But how do you best showcase the might of your empire and the splendor of your civilization? Here, we offer a new feature focused on trade routes. With the newly added Trade Route Path UI, you can visualize all trade routes connecting to your cities—both those established by your own civilization and those arriving from other civilizations. This mod works especially well when combined with Suk's Simple UI Adjustments. While the effect becomes most noticeable in the mid-to-late game, if your civilization is thriving and your cities are flourishing at that stage, you may witness a vast commercial network spanning nearly half the map (see screenshots). This expansive web stands as a powerful testament to your empire's strength and the pinnacle of your civilization's glory. In terms of operation: left-clicking the "Trade Route Path" button in the left-top of the screen will immediately display all domestic trade routes and international trade routes originating from your civilization. Right-clicking the button opens the "Trade Route Panel" , allowing for detailed customization. This includes options to show incoming international trade routes (disabled by default) and to toggle between enhanced, colorful route paths or revert to the original white path style. Of course, this could very well be just the first step toward larger changes to the trade route mechanics in the future. I've prioritized releasing this UI mod early to take advantage of its key benefit: compatibility with existing save files, allowing you to add it mid-game and see immediate effects. In future updates to the trade route system, managing your own trade operations and attracting other civilizations to send trade routes to your cities may become a core gameplay element.