Legg til haptisk tilbakemelding på knappetrykk og listeval (#11)

Android: HapticFeedbackConstants.VIRTUAL_KEY på alle knappar og
listeelement. PWA: navigator.vibrate(10ms) på same interaksjonar.

Closes #11

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pwa/src/app.ts

@@ -76,6 +76,7 @@ function setupButtons(): void {
   // Toggle map/compass
   const toggleFab = document.getElementById('toggle-fab')!;
   toggleFab.addEventListener('click', async () => {
+    navigator.vibrate?.(10);
     isCompassMode = !isCompassMode;
 
     const mapContainer = document.getElementById('map-container')!;
@@ -112,6 +113,7 @@ function setupButtons(): void {
   const cacheRetryBtn = document.getElementById('cache-retry-btn')!;
   cacheRetryBtn.textContent = t('action_cache_now');
   cacheRetryBtn.addEventListener('click', () => {
+    navigator.vibrate?.(10);
     if (currentLocation && navigator.onLine) {
       startCaching(currentLocation.latitude, currentLocation.longitude);
     }
@@ -120,6 +122,7 @@ function setupButtons(): void {
   // Reset view button
   const resetBtn = document.getElementById('reset-view-btn')!;
   resetBtn.addEventListener('click', () => {
+    navigator.vibrate?.(10);
     const selected = nearestShelters[selectedShelterIndex] ?? null;
     mapView.resetView(selected, currentLocation);
     resetBtn.classList.remove('visible');

pwa/src/ui/shelter-list.ts

@@ -52,6 +52,7 @@ export function updateList(
     item.appendChild(addressSpan);
     item.appendChild(detailsSpan);
     item.addEventListener('click', () => {
+      navigator.vibrate?.(10);
       onSelect?.(i);
     });
     container!.appendChild(item);

pwa/src/ui/status-bar.ts

@@ -11,5 +11,8 @@ export function setStatus(text: string): void {
 /** Set the refresh button click handler. */
 export function onRefreshClick(handler: () => void): void {
   const btn = document.getElementById('refresh-btn');
-  if (btn) btn.addEventListener('click', handler);
+  if (btn) btn.addEventListener('click', () => {
+    navigator.vibrate?.(10);
+    handler();
+  });
 }