Keep desktop CI aligned with the build outputs we actually rely on

The local desktop build path already proved that AppImage packaging needs libfuse2 and that macOS artifacts may be directories rather than plain files. This commit aligns the GitHub workflows with those realities so remote validation matches the local release path more closely.

Constraint: GitHub-hosted Linux runners do not guarantee AppImage runtime deps unless we install them explicitly
Rejected: Leave release workflow unchanged and trust local macOS build only | would not validate Linux packaging path at all
Rejected: Upload only DMG/installer files in dev workflow | hides the macOS .app artifact users expect for local testing
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep dev and release desktop dependency lists in sync when packaging requirements change
Tested: git diff --check; YAML parse of both workflow files; manual inspection of artifact collection and Linux dependency steps
Not-tested: Live GitHub Actions execution on repository runners

.github/workflows/build-desktop-dev.yml

@@ -167,14 +167,14 @@ jobs:
 
           echo "Searching for artifacts in: $SEARCH_DIR"
           if [ -d "$SEARCH_DIR" ]; then
-            find "$SEARCH_DIR" -type f \( \
-              -name "*.dmg" -o -name "*.app" -o \
-              -name "*.exe" -o -name "*.msi" -o \
-              -name "*.deb" -o -name "*.AppImage" -o \
-              -name "*.zip" \
-            \) | while read -r f; do
+            find "$SEARCH_DIR" \
+              \( -type f \( \
+                -name "*.dmg" -o -name "*.exe" -o -name "*.msi" -o \
+                -name "*.deb" -o -name "*.AppImage" -o -name "*.zip" \
+              \) \) -o \
+              \( -type d -name "*.app" \) | while read -r f; do
               echo "  Copying: $(basename "$f")"
-              cp "$f" "$STAGING/"
+              cp -R "$f" "$STAGING/"
             done
           fi
 

.github/workflows/release-desktop.yml

@@ -80,7 +80,8 @@ jobs:
             libwebkit2gtk-4.1-dev \
             libayatana-appindicator3-dev \
             librsvg2-dev \
-            patchelf
+            patchelf \
+            libfuse2
 
       # ── Bun ──────────────────────────────────────────────────
       - name: Setup Bun