Add monoline icons to the topbar coordinates/sun readout

WAYPOINT_ICON (coords) and PENDING_ICON (countdown) reused as-is; two new
hand-drawn SUNRISE_ICON/SUNSET_ICON since NPS's symbol set has no match —
same currentColor stroke style as the rest of icons.js, so they render
monochrome in the dark topbar rather than colored emoji.

sun.js's formatSunInfo now returns {sunrise, sunset, countdown} instead of
one joined string, so map.js can place its own icon in front of each
piece instead of the module owning any markup.

public/css/style.css

@@ -36,11 +36,36 @@ html, body {
 
 .topbar__coords,
 .topbar__sun {
+  display: flex;
+  align-items: center;
+  gap: 5px;
   font-size: 12px;
   font-variant-numeric: tabular-nums;
   color: #bbb;
 }
 
+.topbar__sun {
+  gap: 14px;
+}
+
+.topbar__group {
+  display: flex;
+  align-items: center;
+  gap: 5px;
+}
+
+.topbar__icon {
+  display: flex;
+  width: 13px;
+  height: 13px;
+  flex-shrink: 0;
+}
+
+.topbar__icon svg {
+  width: 100%;
+  height: 100%;
+}
+
 .topbar__coords {
   cursor: pointer;
 }