egui037: Port DesignCraft to egui 0.37

Pin the final egui, winit and shared UI revisions and reconcile current main.
Preserve document-epoch input and screenshot boundaries, host action ordering,
and Windows path regression coverage. Add click/End batch characterization.

Validation: all nine Linux CI stages pass (3230 tests, zero failures); Windows
CI and bounded native editing workflows pass on the same production source.

packaging/linux/flatpak/ai.storyteller.designcraft.yml

@@ -46,6 +46,7 @@ modules:
     build-commands:
       - cargo --offline build --release --locked -p designcraft
       - install -Dm755 target/release/designcraft /app/bin/designcraft
+      - install -Dm644 NOTICE /app/share/doc/designcraft/NOTICE
       - install -Dm644 packaging/linux/ai.storyteller.designcraft.desktop /app/share/applications/ai.storyteller.designcraft.desktop
       - install -Dm644 packaging/linux/ai.storyteller.designcraft.mime.xml /app/share/mime/packages/ai.storyteller.designcraft.xml
       - mkdir -p /app/share/icons && cp -R assets/app-icon/hicolor /app/share/icons/

packaging/linux/package.sh

@@ -142,7 +142,6 @@ if has appimage; then
   esac
   APPDIR="$WORK/DesignCraft.AppDir"
   cp -R "$STAGE" "$APPDIR"
-  mv "$APPDIR/usr/share/doc" "$WORK/doc-unused"
   ln -s usr/bin/designcraft "$APPDIR/AppRun"
   cp "$HERE/$APP_ID.desktop" "$APPDIR/$APP_ID.desktop"
   cp "$ROOT/assets/app-icon/hicolor/256x256/apps/$APP_ID.png" "$APPDIR/$APP_ID.png"