fix(updater): quote MSI log argument once

[CompleteDotTech]

Summary

• centralize Windows MSI verbose-log argument construction
• preserve exactly one pair of quotes around the log-file path because tauri-plugin-updater 2.10.1 joins installer arguments into the raw ShellExecuteW parameter string
• add a regression test for a spaced log path that rejects missing or doubled quoting

Root cause

The updater receives installer_args as raw command-line segments, not process arguments. The log path must be quoted once in the final msiexec parameter string so /L*V treats a path containing spaces as one argument. The previous inline formatting left this dependency contract implicit and untested.

Validation

• rustfmt --edition 2021 --check src/tauri_setup.rs
• cargo test msi_verbose_log_path_is_quoted_once_in_shell_execute_parameters --lib
• cargo check
• cargo test --lib (70 passed)

cargo fmt --check still reports pre-existing formatting drift in unrelated Rust files.

Follow-up

Closes #3811. Tracks bead cave-u6ps.

Real Windows hardware update verification remains required before merge: confirm that msi-upgrade-from-<version>-<pid>.log is created and contains verbose MSI output during an upgrade.