frontend/src/components/maps/LocationMapToolbar.jsx

@@ -1,3 +1,5 @@
+import { clampMapZoom } from "../../lib/locationMapUtils";
+
 export default function LocationMapToolbar({
   mode,
   editorTool,
@@ -66,7 +68,7 @@ export default function LocationMapToolbar({
       <div className="location-map-zoom-controls" aria-label="Zoom controls">
         <button
           type="button"
-          onClick={() => setZoom((value) => Math.max(0.45, value - 0.15))}
+          onClick={() => setZoom((value) => Number(clampMapZoom(value - 0.15).toFixed(2)))}
           disabled={!hasAnyMap}
           aria-label="Zoom out"
         >
@@ -75,7 +77,7 @@ export default function LocationMapToolbar({
         <span>{Math.round(zoom * 100)}%</span>
         <button
           type="button"
-          onClick={() => setZoom((value) => Math.min(1.6, value + 0.15))}
+          onClick={() => setZoom((value) => Number(clampMapZoom(value + 0.15).toFixed(2)))}
           disabled={!hasAnyMap}
           aria-label="Zoom in"
         >

frontend/src/lib/locationMapUtils.js

@@ -5,6 +5,9 @@ export const DEFAULT_MAP_SIZE = {
   height: 700,
 };
 
+export const MIN_MAP_ZOOM = 0.3;
+export const MAX_MAP_ZOOM = 1.6;
+
 export const DEFAULT_MAP_FILTERS = {
   showZones: true,
   showLabels: true,
@@ -178,6 +181,10 @@ export function clientPointToMap(event, svgElement, mapSize) {
   return { x, y };
 }
 
+export function clampMapZoom(value) {
+  return Math.max(MIN_MAP_ZOOM, Math.min(MAX_MAP_ZOOM, value));
+}
+
 export function clampObjectToMap(object, mapSize) {
   const width = Math.max(40, Math.min(object.width, mapSize.width));
   const height = Math.max(40, Math.min(object.height, mapSize.height));

frontend/src/pages/LocationMapManager.jsx

@@ -21,6 +21,7 @@ import getApiErrorMessage from "../lib/getApiErrorMessage";
 import {
   DEFAULT_MAP_FILTERS,
   DEFAULT_MAP_SIZE,
+  clampMapZoom,
   clampObjectToMap,
   createClientObject,
   getMapStatus,
@@ -427,12 +428,14 @@ export default function LocationMapManager() {
   };
 
   const handleFitMap = () => {
-    const availableWidth = typeof window === "undefined"
-      ? DEFAULT_MAP_SIZE.width
-      : window.innerWidth >= 840
-        ? window.innerWidth - 420
-        : window.innerWidth - 24;
-    const nextZoom = Math.max(0.45, Math.min(1.6, (availableWidth - 24) / mapSize.width));
+    const scrollElement = svgRef.current?.closest(".location-map-scroll");
+    const fallbackWidth = typeof window === "undefined" ? DEFAULT_MAP_SIZE.width : window.innerWidth;
+    const fallbackHeight = typeof window === "undefined" ? DEFAULT_MAP_SIZE.height : window.innerHeight;
+    const availableWidth = Math.max(280, (scrollElement?.clientWidth || fallbackWidth) - 24);
+    const availableHeight = Math.max(220, (scrollElement?.clientHeight || fallbackHeight) - 24);
+    const nextZoom = clampMapZoom(
+      Math.min(availableWidth / mapSize.width, availableHeight / mapSize.height)
+    );
     setZoom(Number(nextZoom.toFixed(2)));
   };
 

frontend/tests/location-map-manager.spec.ts

@@ -1082,6 +1082,55 @@ test("viewer handles empty and many-item zone panels without default pins", asyn
   await expect(page.locator(".location-map-pin")).toHaveCount(0);
 });
 
+test("mobile fit zoom fits the map into the visible canvas", async ({ page }) => {
+  await page.setViewportSize({ width: 390, height: 844 });
+  await mockMapShell(page);
+
+  const mapState = publishedMapState([
+    {
+      id: 1581,
+      location_map_id: 901,
+      zone_id: 501,
+      zone_name: "Bakery",
+      type: "zone",
+      label: "Bakery",
+      x: 40,
+      y: 40,
+      width: 260,
+      height: 160,
+      rotation: 0,
+      locked: false,
+      visible: true,
+      sort_order: 1,
+    },
+  ], true);
+
+  await page.route("**/households/1/locations/10/map", async (route) => {
+    await route.fulfill({
+      status: 200,
+      contentType: "application/json",
+      body: JSON.stringify(mapState),
+    });
+  });
+
+  await page.goto("/stores/100/locations/10/map");
+  await page.getByRole("button", { name: "Fit" }).click();
+
+  const zoomText = page.locator(".location-map-zoom-controls span");
+  await expect.poll(async () => {
+    const value = await zoomText.textContent();
+    return Number(value?.replace("%", "") || 0);
+  }).toBeLessThan(45);
+
+  const scrollBox = await page.locator(".location-map-scroll").boundingBox();
+  const svgBox = await page.locator(".location-map-svg").boundingBox();
+  expect(scrollBox).not.toBeNull();
+  expect(svgBox).not.toBeNull();
+  if (!scrollBox || !svgBox) throw new Error("Mobile fitted map was not measurable");
+  expect(svgBox.width).toBeLessThanOrEqual(scrollBox.width + 1);
+  expect(svgBox.height).toBeLessThanOrEqual(scrollBox.height + 1);
+});
+
 test("mobile editor uses bottom sheet controls instead of desktop object toolbar", async ({ page }) => {
   await page.setViewportSize({ width: 390, height: 844 });
   await mockMapShell(page);