Release v0.0.27

[vipmax]

What changed

• Prepare the Anycode v0.0.27 release.
• Add multi-buffer change review and Git history workflows.
• Add customizable scrollbar presets and persisted settings/layout.
• Improve editor performance, ACP interactions, Git status feedback, and test coverage.
• Bump the backend version to 0.0.27 and add changelog/release notes.

Validation

• pnpm install --frozen-lockfile
• pnpm -r build
• anycode-example: pnpm install --frozen-lockfile && pnpm build
• cargo test --manifest-path anycode-backend/Cargo.toml — 57 passed, 6 ignored
• cargo build --release --manifest-path anycode-backend/Cargo.toml
• pnpm --filter anycode-base exec vitest run — 77 passed
• GitHub release workflow — Linux x86_64, Linux ARM64, macOS universal, and Windows x64 all passed