v0.2.3: visible cross-panel drag ghost, front-image fallback, shorter hint

- Fix invisible device while dragging from front to rear: the block
  being dragged stayed structurally inside its own source <svg>, so it
  rendered underneath the other panel once it visually overlapped it.
  Replaced the in-SVG transform with a free-floating HTML ghost fixed
  to <body> that tracks the pointer, unaffected by either SVG's own
  stacking - the original block just dims in place during the drag, as
  before.
- Fix rear elevation showing nothing for a device type with no
  rear_image: only full-depth devices (which have a genuinely
  different back) are restricted to their own rear image now; a
  shallow device (e.g. a PDU) falls back to its front image on the
  rear view, since that's usually the only picture that exists and is
  still recognisable either way.
- Shorten the drag-hint badge text; the German translation of the
  previous, longer wording didn't fit well next to the other controls
  above the elevation.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,21 @@
 # Changelog
 
+## 0.2.3
+
+- Fix: dragging a device from front to rear (or back) made it invisible mid-drag - it
+  stayed structurally inside its own source `<svg>`, so it rendered underneath the
+  other panel once it overlapped it instead of over it. Replaced the in-SVG transform
+  with a free-floating HTML "ghost" fixed to `<body>` that tracks the pointer; the
+  original block just dims in place while dragging, exactly like before.
+- Fix: the rear elevation only ever showed a device type's `rear_image`, leaving
+  shallow devices without one (e.g. PDUs) blank on the rear view even when a perfectly
+  usable `front_image` exists. Full-depth devices are unaffected (their rear view still
+  only shows their own rear image, or nothing - showing the front picture there would
+  be wrong); only non-full-depth devices now fall back to the front image on the rear
+  view.
+- Shorten the drag-hint badge text above the elevation (the German translation in
+  particular had gotten too long for the badge).
+
 ## 0.2.2
 
 - Drag-and-drop now supports dragging a device from the front elevation onto the rear