fix: camera button (📷) intercepted by kiosk native btnSettings overlay

- Kiosk (Android): btnSettings was positioned top|end with alpha=0.12,
  sitting invisibly on top of the HTML scan button in the webapp header.
  Moved to bottom|end (marginBottom=80dp, alpha=0.28) so it never
  overlaps the header. Kiosk versionCode 15→16, versionName 1.7.15.
- Web (Android Chrome/Brave): pointerleave fired before pointerup when
  finger drifted, cancelling the long-press timer and letting a synthetic
  click bubble to an unintended handler. Fixed with setPointerCapture +
  preventDefault + replaced pointerleave with pointercancel. Added
  touch-action:manipulation to .header-scan-btn CSS.

CHANGELOG.md

@@ -20,6 +20,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **`pz`/`conf` unit labels translated** — "pz" now shows as "pcs" in English and "Stk" in German; "conf" shows as "pkg" / "Pkg". All `unitLabels` objects in JS now use `t('units.pz')` / `t('units.conf')`.
 
 ### Fixed
+- **Camera button (📷) opened kiosk SettingsActivity on Android** — The native `btnSettings` ImageButton in the kiosk layout was positioned `top|end` with `alpha=0.12` (nearly invisible), sitting directly on top of the HTML scan button in the webapp header. Every tap on the 📷 button was intercepted by the native View and opened `SettingsActivity`. Fixed: moved `btnSettings` to `bottom|end` (above the bottom nav bar, `marginBottom=80dp`) and increased `alpha` to `0.28` so it is clearly separate from the header. Kiosk versionCode bumped to 16.
+- **Camera button (📷) opened settings on Android Chrome/Brave** — `pointerleave` fired before `pointerup` when finger drifted slightly, cancelling the long-press timer and leaving the browser to dispatch a synthetic `click` that bubbled to an unintended handler. Fixed: added `setPointerCapture` (prevents `pointerleave` during touch) and `preventDefault` (blocks synthetic click); replaced `pointerleave` with `pointercancel` handler. Added `touch-action: manipulation` to `.header-scan-btn` CSS.
 - **Logo white background on splash screen** — Re-processed both `logo.png` and `logo_icon.png` with fuzz 35% alpha extraction, removing the white background that was visible against the dark splash background (`#0f172a`).
 - **Recipe button label** — Shortened to "Ricetta" / "Recipe" / "Rezept" for compact display in the inventory quick-action modal.
 - **Quantity decimal precision** — `qtyNum` in recipe/cooking ingredient buttons and `conf` fallback display in inventory cards now limited to 1 decimal place (was showing 7+ decimal places from raw AI output, e.g. `0.25353223 conf`).

assets/css/style.css

@@ -279,6 +279,7 @@ body {
     height: 48px;
     box-shadow: 0 2px 8px rgba(0,0,0,0.18);
     animation: pulse-scan 2s ease-in-out infinite;
+    touch-action: manipulation; /* prevent 300ms delay and double-tap zoom on mobile */
 }
 .header-scan-btn:active {
     background: rgba(255,255,255,0.45);

assets/js/app.js

@@ -14276,6 +14276,8 @@ function initSpesaMode() {
     if (!btn) return;
 
     btn.addEventListener('pointerdown', (e) => {
+        e.preventDefault(); // prevent browser-generated synthetic click + 300ms delay
+        btn.setPointerCapture(e.pointerId); // ensure pointerup always fires on this element even if finger drifts
         _longPressTimer = setTimeout(() => {
             _longPressTimer = null;
             startSpesaMode();
@@ -14289,12 +14291,14 @@ function initSpesaMode() {
             showPage('scan');
         }
     });
-    btn.addEventListener('pointerleave', () => {
+    btn.addEventListener('pointercancel', () => {
+        // OS cancelled gesture (e.g. home swipe) — discard timer, do nothing
         if (_longPressTimer) {
             clearTimeout(_longPressTimer);
             _longPressTimer = null;
         }
     });
+    // Note: no pointerleave handler needed — setPointerCapture prevents it from firing during touch
 }
 
 function startSpesaMode() {

evershelf-kiosk/app/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "it.dadaloop.evershelf.kiosk"
         minSdk = 24
         targetSdk = 34
-        versionCode = 15
-        versionName = "1.7.14"
+        versionCode = 16
+        versionName = "1.7.15"
     }
 
     signingConfigs {

evershelf-kiosk/app/src/main/res/layout/activity_kiosk.xml

@@ -43,17 +43,18 @@
         android:layout_height="match_parent"
         android:visibility="gone" />
 
-    <!-- Settings gear (shown after setup, over WebView) — top-right corner to avoid overlapping modals -->
+    <!-- Settings gear (shown after setup, over WebView) — bottom-right corner so it never
+         overlaps the webapp header buttons (e.g. the 📷 scan button at top-right) -->
     <ImageButton
         android:id="@+id/btnSettings"
         android:layout_width="44dp"
         android:layout_height="44dp"
-        android:layout_gravity="top|end"
-        android:layout_marginTop="8dp"
+        android:layout_gravity="bottom|end"
+        android:layout_marginBottom="80dp"
         android:layout_marginEnd="8dp"
         android:background="@android:color/transparent"
         android:src="@android:drawable/ic_menu_manage"
-        android:alpha="0.12"
+        android:alpha="0.28"
         android:contentDescription="Settings"
         android:scaleType="centerInside"
         android:visibility="gone" />