Update Linux test report

[MingfengHong]

What changed

• Updated docs/TEST_REPORT.md with Linux x64 validation evidence.
• Added Ubuntu 26.04 LTS build environment details, AppImage/DEB build results, launch probes, DEB install/uninstall lifecycle checks, artifact sizes, and SHA-256 hashes.

Why

The previous report said Linux was covered by the native build matrix but had not been validated on a real Linux host. This update records the actual Linux verification completed on Ubuntu 26.04 LTS x86_64.

Impact

Readers can now distinguish the verified Linux AppImage/DEB status from the still-pending macOS runtime validation boundary.

Root cause

Linux validation initially could not run because this local host lacked Rust/Cargo and Tauri Linux build dependencies. After installing the required toolchain and moving Rust temp files away from the quota-limited /tmp, the project built and ran successfully without code changes.

Validation

• npm run check
• npm run build
• npm test
• cargo test --manifest-path src-tauri/Cargo.toml downloads_the_petdex_boba_package -- --ignored
• npm test in server/
• npm run tauri build -- --bundles appimage,deb --ci
• ldd src-tauri/target/release/petpack-studio
• dpkg-deb --info / dpkg-deb -c
• desktop-file-validate /usr/share/applications/PetPack Studio.desktop
• timeout 8 launch probes for release binary, AppImage, and installed /usr/bin/petpack-studio
• npm run docs:build

[gemini-code-assist]

Code Review

This pull request updates the test report (docs/TEST_REPORT.md) to document native verification and packaging results on Linux (Ubuntu 26.04 LTS), including environment details, dependencies, test commands, and artifact hashes. The review feedback recommends replacing hardcoded absolute paths containing local usernames (e.g., /home/hyacinth/...) in the documented commands with a generic variable like $PWD to improve reproducibility and prevent leaking local system details.

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