merge: integrate OrcaSlicer-ImageMap onto kx-v2.4.2 base

Rebuilds experimental/imagemap on the correct base. The previous attempt
merged onto upstream 8500fcdcca, which silently dropped all 13 KX commits
(branding, Gitea updater, Kobra X profile, AMS fixes) and reverted the
Moonraker AMS feature set.

Conflict resolution:
- KX side: branding assets, workflows, Kobra X profile, Gitea updater,
  GUI_App declarations, PrintObject filament-id structure, GLCanvas3D
  reload fixes, PresetBundle extruder validation, ZAA/Polyline3 in GCode.
- ImageMap side: texture/colour machinery (GCode texture sampling,
  ToolOrdering zone resolution, MeshBoolean provenance, CGAL repair
  colour remap, top-surface image fill params).
- Rewrote ImageMap's wall_filament/sparse_infill_filament/
  solid_infill_filament accesses onto the KX *_filament_id options
  instead of adding duplicate config fields.

scripts/flatpak/com.orcaslicer.OrcaSlicer.yml

@@ -345,7 +345,11 @@ modules:
     post-install:
 
       - | # Desktop integration files
-        install -Dm644 -t /app/share/icons/hicolor/scalable/apps/ resources/images/OrcaSlicer.svg
+        install -Dm644 resources/images/OrcaSlicer_32px.png /app/share/icons/hicolor/32x32/apps/OrcaSlicer.png
+        install -Dm644 resources/images/OrcaSlicer_64.png /app/share/icons/hicolor/64x64/apps/OrcaSlicer.png
+        install -Dm644 resources/images/OrcaSlicer_128px.png /app/share/icons/hicolor/128x128/apps/OrcaSlicer.png
+        install -Dm644 resources/images/OrcaSlicer_192px.png /app/share/icons/hicolor/192x192/apps/OrcaSlicer.png
+        install -Dm644 resources/images/OrcaSlicer.png /app/share/icons/hicolor/256x256/apps/OrcaSlicer.png
         install -Dm644 ${FLATPAK_ID}.metainfo.xml /app/share/metainfo/${FLATPAK_ID}.metainfo.xml
         desktop-file-edit --set-key=Exec --set-value="entrypoint %U" /app/share/applications/${FLATPAK_ID}.desktop
         install -Dm755 entrypoint /app/bin
@@ -382,6 +386,8 @@ modules:
         path: ../../LICENSE.txt
       - type: file
         path: ../../version.inc
+      - type: file
+        path: ../../version_number.txt
       - type: file
         path: ../run_gettext.sh
         dest: scripts