fix(build): name macOS DMGs after the app + stop wiping other variants' artifacts

- The macOS DMG filename used a separate hardcoded DMG_BASENAME ("DragonX_Wallet"),
  so the export didn't match the .app/zip (ObsidianDragon). Derive it from
  APP_BASENAME: full-node -> ObsidianDragon-*.dmg, lite -> ObsidianDragonLite-*.dmg.
  The mounted volume + CFBundleName keep the "DragonX Wallet" display branding.
- build_release_mac did `rm -rf "$out"`, wiping all of release/mac on every build, so
  building one variant destroyed the other's artifacts. Scope the cleanup to the
  current variant's files (as the Linux/Windows release paths already do) so the
  full-node and lite releases coexist.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

build.sh

@@ -1055,8 +1055,12 @@ TOOLCHAIN
     info "Binary: $(du -h "bin/${APP_BASENAME}" | cut -f1)"
 
     # ── Create .app bundle ───────────────────────────────────────────────────
-    rm -rf "$out"
     mkdir -p "$out"
+    # Clean only THIS variant's prior artifacts so full-node and lite releases can
+    # coexist in release/mac/ (Linux/Windows scope their cleanup the same way). The
+    # "ObsidianDragon-" glob never matches "ObsidianDragonLite-" (and vice versa),
+    # and the ".app" names are exact.
+    rm -rf "$out/${APP_BASENAME}.app" "$out/${APP_BASENAME}-"*.app.zip "$out/${APP_BASENAME}-"*.dmg
 
     local APP="$out/${APP_BASENAME}.app"
     local CONTENTS="$APP/Contents"
@@ -1256,8 +1260,10 @@ PLIST
     fi
 
     # ── Create DMG ───────────────────────────────────────────────────────────
-    local DMG_BASENAME="DragonX_Wallet"
-    $DO_LITE && DMG_BASENAME="DragonX_Wallet_Lite"
+    # DMG filename matches the app bundle name (ObsidianDragon / ObsidianDragonLite).
+    # The mounted volume + CFBundleName keep the "DragonX Wallet" display branding
+    # (APP_DISPLAY_NAME above).
+    local DMG_BASENAME="${APP_BASENAME}"
     local DMG_NAME="${DMG_BASENAME}-${VERSION}-macOS-${MAC_ARCH}.dmg"
 
     if command -v create-dmg &>/dev/null; then