Improve milestone visibility on the map (#143)

Followup from #139

Changes:
- Font to a monospaced font (Fira Code)
- Color to slightly purple to differentiate from railway line labels
- Fix for railway positions without decimals cut off


![image](https://github.com/user-attachments/assets/0705f116-adcb-4d55-b100-19755cf7e38b)


![image](https://github.com/user-attachments/assets/dc8232cd-bc83-4442-9cee-adac3172edd4)


![image](https://github.com/user-attachments/assets/15f99b26-e005-4b7a-90fe-27402167fae5)

import/sql/functions.sql

@@ -49,7 +49,7 @@ $$ LANGUAGE plpgsql
     LEAKPROOF
     PARALLEL SAFE;
 
-CREATE OR REPLACE FUNCTION railway_pos_round(km_pos TEXT) RETURNS NUMERIC AS $$
+CREATE OR REPLACE FUNCTION railway_pos_round(km_pos TEXT, decimals int) RETURNS NUMERIC AS $$
 DECLARE
   pos_part1 TEXT;
   km_float NUMERIC(8, 3);
@@ -59,8 +59,8 @@ BEGIN
     RETURN NULL;
   END IF;
   km_float := pos_part1::NUMERIC(8, 3);
-  km_float := round(km_float, 1);
-  RETURN trunc(km_float, 1);
+  km_float := round(km_float, decimals);
+  RETURN trunc(km_float, decimals);
 END;
 $$ LANGUAGE plpgsql
     IMMUTABLE

import/sql/tile_views.sql

@@ -248,13 +248,13 @@ CREATE OR REPLACE VIEW railway_text_km AS
     railway,
     pos,
     (railway_pos_decimal(pos) = '0') as zero,
-    left(pos, -2) as pos_int
+    railway_pos_round(pos, 0)::text as pos_int
   FROM
     (SELECT
        id,
        way,
        railway,
-       COALESCE(railway_position, railway_pos_round(railway_position_exact)::text) AS pos
+       COALESCE(railway_position, railway_pos_round(railway_position_exact, 1)::text) AS pos
      FROM railway_positions
     ) AS r
   WHERE pos IS NOT NULL

proxy/js/styles.mjs

@@ -1078,7 +1078,7 @@ const railwayKmText = {
     true,
   ],
   paint: {
-    'text-color': 'black',
+    'text-color': 'hsl(268, 100%, 40%)',
     'text-halo-color': ['case',
       ['boolean', ['feature-state', 'hover'], false], colors.hover.textHalo,
       'white',
@@ -1092,7 +1092,7 @@ const railwayKmText = {
       13,
       ['get', 'pos'],
     ],
-    'text-font': ['Noto Sans Bold'],
+    'text-font': ['Fira Code Bold'],
     'text-size': 11,
   },
 };
@@ -3945,6 +3945,7 @@ const legendData = {
         type: 'point',
         properties: {
           zero: true,
+          pos_int: '47',
           pos: '47.0',
         },
       },
@@ -4039,6 +4040,17 @@ const legendData = {
         },
       },
     ],
+    "high-railway_text_km": [
+      {
+        legend: 'Milestone',
+        type: 'point',
+        properties: {
+          zero: true,
+          pos_int: '47',
+          pos: '47.0',
+        },
+      },
+    ],
     'openrailwaymap_speed-speed_railway_signals': [
       // TODO filter per country polygon
       ...speed_railway_signals.features.map(feature => ({
@@ -4197,6 +4209,17 @@ const legendData = {
         ],
       },
     ],
+    "high-railway_text_km": [
+      {
+        legend: 'Milestone',
+        type: 'point',
+        properties: {
+          zero: true,
+          pos_int: '47',
+          pos: '47.0',
+        },
+      },
+    ],
     'openrailwaymap_signals-signals_railway_signals': [
       ...signals_railway_signals.features.map(feature => ({
         legend: `${feature.country ? `(${feature.country}) ` : ''}${feature.description}`,
@@ -4447,6 +4470,17 @@ const legendData = {
         },
       },
     ],
+    "high-railway_text_km": [
+      {
+        legend: 'Milestone',
+        type: 'point',
+        properties: {
+          zero: true,
+          pos_int: '47',
+          pos: '47.0',
+        },
+      },
+    ],
     'openrailwaymap_electrification-electrification_signals': [
       ...electrification_signals.features.map(feature => ({
         legend: `(${feature.country}) ${feature.description}`,
@@ -4802,6 +4836,17 @@ const legendData = {
         },
       },
     ],
+    "high-railway_text_km": [
+      {
+        legend: 'Milestone',
+        type: 'point',
+        properties: {
+          zero: true,
+          pos_int: '47',
+          pos: '47.0',
+        },
+      },
+    ],
   },
   loading_gauge: {
     'openrailwaymap_low-railway_line_low': [
@@ -4876,6 +4921,17 @@ const legendData = {
         },
       },
     ],
+    "high-railway_text_km": [
+      {
+        legend: 'Milestone',
+        type: 'point',
+        properties: {
+          zero: true,
+          pos_int: '47',
+          pos: '47.0',
+        },
+      },
+    ],
   },
 }