Swap the pin marker for a rounded-square badge

The National Park Service frames its own map symbols (the icons already
vendored in for POI categories) in a rounded square, not a pin — pairing a
pin shape with NPS-style pictograms looked like two mismatched icon
conventions. Switched the marker to a rounded square to match.

This also simplifies the placement code: a pin has to anchor at its tip, so
the category glyph on top needed an offset computed from the pin/glyph
geometry to land in the pin's head. A square has no tip — both the badge and
the glyph layer just center directly on the coordinate with no offset math
at all.

public/js/gpx.js

@@ -6,7 +6,7 @@ import {
   WAYPOINT_ICON,
   TRACK_ICON,
   ROUTE_ICON,
-  MAP_PIN_ICON,
+  MAP_MARKER_ICON,
   POI_ICONS,
 } from "/js/icons.js";
 import { notifySidePanelOpen, onlyOneSidePanelOpen } from "/js/panels.js";
@@ -19,24 +19,9 @@ const MOVE_URL = "/api/gpx/move";
 const TRACK_COLOR = "#e63946";
 const POI_ICON_KEYS = Object.keys(POI_ICONS);
 const POI_ICON_IMAGE_SIZE = 48; // rasterized once at this size, rendered much smaller by icon-size below
-const POI_ICON_SIZE = 0.3; // 48 * 0.3 = ~14px, matching the pin head's diameter below
-
-// The pin glyph (icons.js's MAP_PIN_ICON) is a 24x24 viewBox with its head
-// circle centered at y=9, rasterized onto the same POI_ICON_IMAGE_SIZE
-// canvas as every other icon. icon-anchor: "bottom" anchors both this layer
-// and the category-glyph layer below to the *raster canvas's* bottom edge
-// (not the pin's visual tip, which sits a little above that edge) — so both
-// layers share one screen anchor point, and placing the glyph in the pin's
-// head is just "how far above that shared anchor is each icon's own visual
-// center, and what's the gap between them":
-const MAP_PIN_ID = "map-pin";
-const MAP_PIN_SIZE = 0.55;
-const MAP_PIN_HEAD_CENTER_SVG_Y = 9;
-const MAP_PIN_VIEWBOX = 24;
-const pinHeadCenterAboveAnchorPx =
-  (MAP_PIN_VIEWBOX - MAP_PIN_HEAD_CENTER_SVG_Y) * (POI_ICON_IMAGE_SIZE / MAP_PIN_VIEWBOX) * MAP_PIN_SIZE;
-const glyphOwnCenterAboveAnchorPx = (POI_ICON_IMAGE_SIZE * POI_ICON_SIZE) / 2; // glyph content roughly fills its own canvas
-const POI_ICON_OFFSET_Y = -((pinHeadCenterAboveAnchorPx - glyphOwnCenterAboveAnchorPx) / POI_ICON_SIZE);
+const POI_ICON_SIZE = 0.3; // 48 * 0.3 = ~14px, sized to sit inside the marker badge below
+const MAP_MARKER_ID = "map-marker";
+const MAP_MARKER_SIZE = 0.55;
 
 // Custom drag payload MIME type for moving an already-uploaded file between
 // folders, as opposed to an OS file drag (type "Files") for uploading a new
@@ -71,7 +56,7 @@ export class GpxPanelControl {
   // color information worth preserving, and SDF lets the same sprite be
   // reused if a future category needs a different tint.
   async _registerPoiIcons() {
-    const sources = { ...POI_ICONS, [MAP_PIN_ID]: MAP_PIN_ICON };
+    const sources = { ...POI_ICONS, [MAP_MARKER_ID]: MAP_MARKER_ICON };
     await Promise.all(
       Object.keys(sources).map(async (key) => {
         if (this._map.hasImage(key)) return;
@@ -424,20 +409,23 @@ export class GpxPanelControl {
       layout: { "text-field": ["get", "point_count_abbreviated"], "text-font": ["Noto Sans Regular"], "text-size": 11 },
       paint: { "text-color": "#fff" },
     });
-    // A pin (icons.js's MAP_PIN_ICON), not a plain circle: a flat colored
-    // dot looks too much like a base map style's own small circular POI
-    // icons, so individual waypoints blended in and were hard to spot as
-    // "your data" versus the map's own points. Anchored at its tip (the
-    // standard map-pin convention), not centered on the coordinate.
+    // A rounded-square badge (icons.js's MAP_MARKER_ICON), not a plain
+    // circle: a flat colored dot looked too much like a base map style's
+    // own small circular POI icons, so individual waypoints blended in
+    // instead of standing out as "your data". A rounded square rather than
+    // a pin/teardrop specifically to match how the NPS itself frames these
+    // exact category symbols (POI_ICONS below) on its own maps. Centered on
+    // the coordinate — a square has no natural "tip" the way a pin does, so
+    // default center anchoring is simplest and also means the glyph layer
+    // below needs no offset, just the same center anchor.
     this._map.addLayer({
       id: `${pointsId}-unclustered`,
       type: "symbol",
       source: pointsId,
       filter: ["!", ["has", "point_count"]],
       layout: {
-        "icon-image": MAP_PIN_ID,
-        "icon-size": MAP_PIN_SIZE,
-        "icon-anchor": "bottom",
+        "icon-image": MAP_MARKER_ID,
+        "icon-size": MAP_MARKER_SIZE,
         "icon-allow-overlap": true,
         "icon-ignore-placement": true,
       },
@@ -445,9 +433,7 @@ export class GpxPanelControl {
     });
     // Only for the curated POI_ICON_KEYS (see icons.js) — anything else
     // (a plain hand-placed waypoint, or a category p4n2gpx/OsmAnd hasn't
-    // been taught here) just keeps the plain pin above with no glyph.
-    // icon-offset moves it up from the anchor (the pin's tip) into the
-    // pin's round head — see POI_ICON_OFFSET_Y's comment above.
+    // been taught here) just keeps the plain badge above with no glyph.
     this._map.addLayer({
       id: `${pointsId}-unclustered-icon`,
       type: "symbol",
@@ -456,8 +442,6 @@ export class GpxPanelControl {
       layout: {
         "icon-image": ["get", "icon"],
         "icon-size": POI_ICON_SIZE,
-        "icon-anchor": "bottom",
-        "icon-offset": [0, POI_ICON_OFFSET_Y],
         "icon-allow-overlap": true,
         "icon-ignore-placement": true,
       },