07-Mar-2026 — backgrounds view, events row, and admin improvements ref #12

build 511 — commit 0e1fd12

New backgrounds album view with smooth crossfade transitions between photos and wave-transparency overlays. Text and event links are displayed over the imagery with configurable colours, scale, padding, and markdown content that can now be edited directly in-place on the preview. Colour selections (Title Colour, Text Colour) now persist correctly after saving. The admin panel has been tidied up with consistent range sliders for padding and offset controls, and a reusable RangeSliderComponent for future use. Events can now be displayed as a page content row with server-side pagination that no longer causes a full page refresh. Walks pages are migrated to use this new events row pattern. Also removed the legacy social carousel, fixed a gap above the gallery view, added PNG upload preview support, and ensured the selected album view persists across page refreshes in edit mode.