Add mobileWallLayout plugin (#680)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/mobileWallLayout/README.md

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+# Mobile Wall Layout
+
+Makes the wall-mode gallery render as a single full-width column on mobile
+devices, on the **Markers** (`/scenes/markers`) and **Images** (`/images`) pages.
+
+By default, Stash's wall mode uses `react-photo-gallery`, which calculates
+`position: absolute` offsets for a multi-column brick layout. On small screens
+this produces items that are too small to comfortably tap and browse. This
+plugin overrides those offsets so each item spans the full width of the screen,
+making marker previews and images easy to scroll through on a phone.
+
+## Behaviour
+
+- Applies only when `window.innerWidth ≤ 960px` — covers all current phones
+  including large flagships in landscape (e.g. iPhone 16 Pro Max: 932px,
+  Galaxy S24 Ultra: 915px), while excluding tablets (iPad mini landscape: 1024px).
+- Activates and deactivates automatically as you navigate between pages.
+- Re-evaluates on orientation change (portrait ↔ landscape).
+- Has no effect on desktop or tablet viewports.
+
+## Implementation note
+
+The fix injects a `<style>` tag with `!important` rules rather than setting
+inline styles via JavaScript. This is necessary because `react-photo-gallery`
+continuously recalculates and re-applies its own inline styles; a CSS rule with
+`!important` wins unconditionally regardless of render timing.

plugins/mobileWallLayout/mobileWallLayout.js

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+/**
+ * Mobile Layout Fix — Stash UI Plugin
+ * =====================================
+ * Forces full-width single-column layout on the Markers and Images (wall mode)
+ * pages, where react-photo-gallery sets inline position:absolute offsets that
+ * cause items to overlap or overflow on mobile.
+ *
+ * Fix: inject a <style> tag with !important rules that override the library's
+ * inline styles, making the layout rendering-order-independent. A JS-based
+ * approach (setting el.style directly) loses to library re-renders; CSS wins
+ * unconditionally.
+ *
+ * The style tag is added when entering /images or /scenes/markers and removed
+ * on navigation away, so it never affects other views.
+ *
+ * Architecture:
+ *   A single MutationObserver watches for DOM changes caused by Stash's SPA
+ *   navigation and re-evaluates which page is active.
+ */
+
+// ── Images + Markers pages: CSS injection for mobile full-width layout ────────
+// Both /images (wall mode) and /scenes/markers use react-photo-gallery, which
+// sets inline position:absolute styles. A <style> tag with !important beats
+// inline styles regardless of render timing, avoiding the race condition that
+// JS-based inline overrides suffer from.
+//
+// The 960px threshold covers all current phones including large flagships in
+// landscape (e.g. iPhone 16 Pro Max: 932px, Galaxy S24 Ultra: 915px) while
+// excluding tablets (iPad mini landscape: 1024px). The resize listener ensures
+// the fix is applied/removed correctly on orientation change.
+
+var _imagesStyleTag = null;
+
+// Uses !important throughout so these rules win over react-photo-gallery's
+// inline `style="position:absolute; top:Xpx; left:Ypx"` attributes.
+var _IMAGES_CSS = [
+    'div.react-photo-gallery--gallery {',
+    '    display: block !important;',
+    '}',
+    '.wall-item {',
+    '    position: relative !important;',  /* pull items back into normal flow */
+    '    width:    100%   !important;',
+    '    height:   auto   !important;',
+    '    top:      auto   !important;',    /* neutralise calculated pixel offsets */
+    '    left:     auto   !important;',
+    '    display:  block  !important;',
+    '    margin-bottom: 10px !important;',
+    '}',
+    '.wall-item img, .wall-item video {',
+    '    width:       100%    !important;',
+    '    height:      auto    !important;',
+    '    object-fit:  contain !important;',
+    '}'
+].join('\n');
+
+function updateImagesPageFix() {
+    var href = window.location.href;
+    var onTargetPage = (href.includes('/images') || href.includes('scenes/markers'))
+        && window.innerWidth <= 960;
+
+    if (onTargetPage && !_imagesStyleTag) {
+        // Entering images or markers page — inject the fix
+        _imagesStyleTag = document.createElement('style');
+        _imagesStyleTag.id = 'mobile-layout-fix-images';
+        _imagesStyleTag.textContent = _IMAGES_CSS;
+        document.head.appendChild(_imagesStyleTag);
+    } else if (!onTargetPage && _imagesStyleTag) {
+        // Leaving — clean up so other pages are unaffected
+        _imagesStyleTag.remove();
+        _imagesStyleTag = null;
+    }
+}
+
+// ── Shared MutationObserver ───────────────────────────────────────────────────
+// Stash is a React SPA; page "navigation" is DOM mutation, not a real load.
+// Observing childList + subtree on body catches both navigation and lazy-
+// loaded gallery content without needing a polling interval.
+
+var observer = new MutationObserver(updateImagesPageFix);
+observer.observe(document.body, { childList: true, subtree: true });
+
+// Re-evaluate on orientation change (portrait ↔ landscape)
+window.addEventListener('resize', updateImagesPageFix);
+
+// Run immediately for whichever page is loaded first
+updateImagesPageFix();

plugins/mobileWallLayout/mobileWallLayout.yml

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+name: Mobile Wall Layout
+description: >
+  On the Markers and Images pages, forces the wall-mode gallery to render as a
+  single full-width column on mobile devices (phones in portrait or landscape,
+  up to ~960px wide). Tablets and desktops are unaffected.
+version: 1.0
+ui:
+  javascript:
+    - mobileWallLayout.js