Implement tiered route system with enhanced CSV export

This commit introduces a comprehensive tiered route generation system that replaces the basic route categories with specific route types based on medieval transportation networks:

Route System Changes:
- Major Sea Routes (majorSea): Long-distance maritime trade routes connecting capitals and major ports across water bodies, simulating Hanseatic League-style trade networks
- Regional Sea Routes (regional): Shorter routes within specific water bodies for high-traffic local maritime trade
- Royal Roads (royal): Capital-to-capital connections for diplomatic and military movement using minimum spanning tree algorithm
- Market Roads (market): Regional trade networks connecting market towns with 15-30km spacing based on medieval market day travel distances
- Local Roads (local): Village-to-market connections linking settlements to their nearest commercial centers
- Footpaths (footpath): Hamlet paths with 3-8km range for local community connections

Implementation Details:
- Removed fallback calls to legacy route generation functions to ensure clean tiered system operation
- Routes now include both 'group' (general category) and 'type' (specific tier) properties for detailed classification
- Enhanced route generation uses settlement hierarchy and geographic constraints for realistic medieval transportation patterns
- Route cost modifiers applied based on route type importance (royal and majorSea routes have priority routing)

CSV Export Enhancements:
- Added 'Type' column to routes CSV export to distinguish between route tiers
- Updated routes overview UI to display both group and type information
- Enhanced header layout to accommodate new type column
- Routes can now be analyzed by both general category and specific function

Technical Changes:
- Fixed route ID assignment conflicts between immediate and background processing phases
- Improved route data structure consistency across generation phases
- Updated routes overview display to show detailed route type information
- Enhanced CSV export function to include route type data from pack.routes

modules/routes-generator.js

@@ -353,9 +353,6 @@ window.Routes = (function () {
         });
       }
       
-      // Also use existing main roads logic for primary centers
-      const mainRoads = generateMainRoads();
-      marketRoads.push(...mainRoads);
       
       TIME && console.timeEnd("generateMarketRoads");
       return marketRoads;
@@ -428,9 +425,6 @@ window.Routes = (function () {
         }
       });
       
-      // Also include existing secondary roads
-      const secondaryRoads = generateSecondaryRoads();
-      localRoads.push(...secondaryRoads);
       
       TIME && console.timeEnd("generateLocalRoads");
       return localRoads;
@@ -504,9 +498,6 @@ window.Routes = (function () {
         }
       });
       
-      // Also include existing trails for backward compatibility
-      const trails = generateTrails();
-      footpaths.push(...trails);
       
       TIME && console.timeEnd("generateFootpaths");
       return footpaths;
@@ -757,8 +748,9 @@ window.Routes = (function () {
       return segments;
     }
 
-    function createRoutesData(routes) {
+    function createRoutesData(lockedRoutes) {
       const pointsArray = preparePointsArray();
+      const routes = [...lockedRoutes]; // Create a new array from locked routes
 
       // Process critical routes (Tier 1 & 2) - these run immediately
       for (const {feature, cells, merged, type} of mergeRoutes(majorSeaRoutes)) {