Prepare v1.0.0-beta.13 prerelease

[enaboapps]

Summary

• bump Switchify PC to 1.0.0-beta.13 across package, Tauri, Cargo, startup launcher, browser fallback, and configuration-test metadata
• prepare the prerelease containing the Windows secondary-monitor pointer-axis fix from Fix diagonal pointer drift on Windows secondary monitors #651

Validation

• npm run lint
• npm test, 74 Vitest tests and 5 release-feed tests passed
• npm run build
• cargo fmt --manifest-path src-tauri/Cargo.toml --check
• cargo clippy --locked --manifest-path src-tauri/Cargo.toml --all-targets -- -D warnings
• cargo test --locked --manifest-path src-tauri/Cargo.toml, 220 unit tests and 2 configuration tests passed
• confirmed all managed version locations are 1.0.0-beta.13 and no beta.12 value remains in the release set

Closes #653

[enaboapps]

Independent exact-head review

Reviewed commit 3fe85fca48b7fa68a440c44d52f5e264d6533866 after the release bump.

No findings. The review confirmed that the PR changes only the expected nine managed version files, all release metadata is 1.0.0-beta.13, shipping identity is unchanged, updater placeholders remain intact, and protocol and persisted-state schemas remain at version 1.

The included product change is limited to the merged Windows pointer-axis fix from #651.

[enaboapps]

Final validation at exact head \3fe85fca48b7fa68a440c44d52f5e264d6533866: independent review found no actionable issues; local Node 24 and Rust 1.97.1 validation passed; frontend, macOS packaging, and Windows UIAccess packaging CI are green.