Release CI: bypass failing DMG bundling for macOS aarch64 Tauri build

[Copilot]

Build Tauri (macos-aarch64) fails in release workflow after successful compilation, during bundle_dmg.sh execution. This change isolates that target from DMG packaging while preserving existing behavior for other release targets.

• Workflow targeting

  • Added a per-matrix bundle_args field in .github/workflows/release.yml.
  • Set bundle_args: "--bundles app" only for macos-aarch64.
  • Left other targets with empty bundle_args (no behavior change).

• Tauri invocation

  • Updated Tauri action args to append matrix-specific bundling flags.

- runner: macos-14
  target: aarch64-apple-darwin
  os_name: macos
  arch: aarch64
  bundle_args: "--bundles app"

# ...
args: --target ${{ matrix.target }} ${{ matrix.bundle_args }}

• Effect on release artifacts
  • macos-aarch64 now produces .app bundle output (no .dmg on that lane).
  • macOS x86_64 / Linux / Windows packaging behavior remains unchanged.