egui037-20261022: migrate DeckCraft to egui 0.37

Preserve current-main document and PDF behavior alongside the reviewed input, capture, font, ribbon and notice-packaging migration.

Validation: cargo xtask ci passed all eight stages, with 1,877 workspace tests and three doctests passed, six tests ignored, strict native lint and 23 WASM crates checked. Native GUI, platform and performance qualification remains separate.

packaging/linux/package.sh

@@ -19,6 +19,12 @@ set -euo pipefail
 HERE="$ROOT/packaging/linux"
 APP_ID=ai.storyteller.deckcraft
 
+verify_sha256() {
+  local expected="$1"
+  local file="$2"
+  printf '%s  %s\n' "$expected" "$file" | sha256sum -c -
+}
+
 SKIP_BUILD=0
 FORMATS="appimage deb rpm tar"
 while [[ $# -gt 0 ]]; do
@@ -137,21 +143,21 @@ if has appimage; then
       download="$TOOL.download"
       curl --proto '=https' -fsSL -o "$download" \
         "https://github.com/AppImage/appimagetool/releases/download/$APPIMAGETOOL_VERSION/appimagetool-$ARCH.AppImage"
-      printf '%s  %s\n' "$APPIMAGETOOL_SHA256" "$download" | sha256sum -c -
+      verify_sha256 "$APPIMAGETOOL_SHA256" "$download"
       chmod 755 "$download"
       mv "$download" "$TOOL"
     fi
-    printf '%s  %s\n' "$APPIMAGETOOL_SHA256" "$TOOL" | sha256sum -c -
+    verify_sha256 "$APPIMAGETOOL_SHA256" "$TOOL"
   fi
   RUNTIME="$CARGO_TARGET_DIR/appimage-runtime-$APPIMAGE_RUNTIME_VERSION-$ARCH"
   if [[ ! -f "$RUNTIME" ]]; then
     download="$RUNTIME.download"
     curl --proto '=https' -fsSL -o "$download" \
       "https://github.com/AppImage/type2-runtime/releases/download/$APPIMAGE_RUNTIME_VERSION/runtime-$ARCH"
-    printf '%s  %s\n' "$APPIMAGE_RUNTIME_SHA256" "$download" | sha256sum -c -
+    verify_sha256 "$APPIMAGE_RUNTIME_SHA256" "$download"
     mv "$download" "$RUNTIME"
   fi
-  printf '%s  %s\n' "$APPIMAGE_RUNTIME_SHA256" "$RUNTIME" | sha256sum -c -
+  verify_sha256 "$APPIMAGE_RUNTIME_SHA256" "$RUNTIME"
   # Absolute, because appimagetool runs in $DIST below (CARGO_TARGET_DIR or APPIMAGETOOL may be
   # relative).
   OUT="$(cd "$DIST" && pwd)/$BASENAME.AppImage"