feat(route-builder): SAC-red trail + refit map on image drop

Trail polyline now uses the same SAC white-red-white red as the /hikes
overview and detail pages so the live preview reads as the final
published track. Dropping geolocated images now reframes the edit map
to the new bounds via a shared `mapView.fitTick` signal — covers GPX
imports too if they ever wire it up.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.77.1",
+	"version": "1.77.2",
 	"private": true,
 	"type": "module",
 	"scripts": {

src/lib/components/hikes/route-builder/EditMap.svelte

@@ -2,9 +2,11 @@
 	import type { Attachment } from 'svelte/attachments';
 	import {
 		builder,
+		mapView,
 		nextWaypointId,
 		scheduleSave
 	} from './builderStore.svelte';
+	import { SAC_TRAIL_COLOR } from '$lib/data/sacColors';
 	// Single-point Swisstopo elevation lookups are intentionally NOT used —
 	// they returned 0 against WGS-84 inputs in practice, and image waypoints
 	// don't need per-point altitudes anyway. Waypoint altitudes flow from
@@ -135,14 +137,14 @@
 				// Lines: per-pair so each can carry a segIdx for inline insertion.
 				// Snapped + linear segments share the same visual styling — there's
 				// no need to call out the difference, the user picked the mode.
-				const primary =
+				// SAC white-red-white red — matches /hikes overview + detail-page
-					getComputedStyle(document.documentElement).getPropertyValue('--color-primary').trim() ||
+				// trail colour so the live preview reads as the final published track.
-					'#5e81ac';
+				const trackColor = SAC_TRAIL_COLOR.T2;
 				if (builder.routedSegments.length > 0) {
 					builder.routedSegments.forEach((seg, segIdx) => {
 						const latLngs = seg.map((p) => [p[1], p[0]] as [number, number]);
 						const poly = L.polyline(latLngs, {
-							color: primary,
+							color: trackColor,
 							weight: 4,
 							opacity: 0.9
 						}).addTo(lineLayer);
@@ -155,6 +157,23 @@
 				}
 			}
 
+			function fitToTrack() {
+				const points: [number, number][] = [];
+				for (const w of builder.waypoints) {
+					if (w.unplaced) continue;
+					points.push([w.lat, w.lng]);
+				}
+				for (const seg of builder.routedSegments) {
+					for (const p of seg) points.push([p[1], p[0]]);
+				}
+				if (points.length === 0) return;
+				if (points.length === 1) {
+					map.setView(points[0], 13);
+					return;
+				}
+				map.fitBounds(L.latLngBounds(points), { padding: [40, 40] });
+			}
+
 			// React to store changes.
 			const stopRoot = $effect.root(() => {
 				$effect(() => {
@@ -166,6 +185,17 @@
 					builder.routedSegments.length;
 					render();
 				});
+
+				// External fit-bounds requests (image drops, GPX imports).
+				// The map's own init-time auto-fit covers first-load; this
+				// effect handles every subsequent batch insertion.
+				let lastTick = mapView.fitTick;
+				$effect(() => {
+					const tick = mapView.fitTick;
+					if (tick === lastTick) return;
+					lastTick = tick;
+					fitToTrack();
+				});
 			});
 
 			// Click on blank map. In normal mode, append a new waypoint at the end.

src/lib/components/hikes/route-builder/ImageDropzone.svelte

@@ -3,6 +3,7 @@
 		builder,
 		insertWaypointChronologically,
 		nextWaypointId,
+		requestFitBounds,
 		scheduleSave,
 		type Waypoint
 	} from './builderStore.svelte';
@@ -135,15 +136,23 @@
 		// by snap-to-route enrichment) is the only reliable elevation
 		// source against WGS-84 inputs, and its single-point variant kept
 		// returning 0 even with workaround attempts.
+		let placedAny = false;
 		for (const p of prepared) {
 			if (!p.ok) continue;
-			if (p.kind === 'new') insertWaypointChronologically(p.wp);
+			if (p.kind === 'new') {
+				insertWaypointChronologically(p.wp);
+				if (p.hasGps) placedAny = true;
+			}
 			// Cache the original file so the waypoint table can show a
 			// full-resolution preview this session (for both new + matched
 			// waypoints). Persistence to localStorage keeps only the small
 			// thumbnail.
 			setFullImage(p.id, p.file);
 		}
+		// Reframe the map to the new track. Only matters when the batch
+		// added at least one geolocated waypoint — unplaced images don't
+		// affect bounds, and matched-only drops leave coords unchanged.
+		if (placedAny) requestFitBounds();
 	}
 
 	function onDrop(e: DragEvent) {

src/lib/components/hikes/route-builder/builderStore.svelte.ts

@@ -107,6 +107,17 @@ function defaultState(): BuilderState {
 
 export const builder = $state<BuilderState>(loadDraft());
 
+/**
+ * UI-only signal for the edit map: bumping `fitTick` asks the map to
+ * re-run `fitBounds()` on the current track. Used after batch insertions
+ * (image drops, GPX import) where the user expects the map to reframe to
+ * show every newly-added waypoint. Not persisted.
+ */
+export const mapView = $state({ fitTick: 0 });
+export function requestFitBounds(): void {
+	mapView.fitTick++;
+}
+
 let saveTimer: ReturnType<typeof setTimeout> | null = null;
 export function scheduleSave(): void {
 	if (!browser) return;