zoom-out: always enabled, back to start when no stack

wwwroot/app.js

@@ -112,7 +112,7 @@ async function loadView() {
 
   $('range-label').textContent =
     `${fmtDateTime(viewFrom)} - ${fmtDateTime(viewTo)}  (${entryMode ? 'Einträge' : ZOOM_LEVELS[zoomIndex].name})`;
-  $('btn-zoom-out').disabled = zoomStack.length === 0 && zoomIndex === 0 && !entryMode;
+  $('btn-zoom-out').textContent = zoomStack.length === 0 ? '← Startseite' : '← Raus-Zoomen';
 
   const [summary, chains] = await Promise.all([
     api(`/api/cost-summary?from=${enc(from)}&to=${enc(to)}`),
@@ -452,15 +452,18 @@ function zoomOut() {
     viewTo    = prev.to;
     zoomIndex = prev.zoom;
     entryMode = prev.entry;
+    loadView();
   } else {
-    // Reset to default view
+    // Back to start
+    location.hash = '';
     zoomIndex = 0;
     entryMode = false;
+    zoomStack = [];
     const range = getAnchoredRange(zoomIndex);
     viewFrom = range.from;
     viewTo = range.to;
+    loadView();
   }
-  loadView();
 }
 
 // --- Sync ---