[Dexarim]

Summary

• split an app-launch command into the executable and arguments before calling QProcess::startDetached
• preserve quoted arguments instead of treating the complete command string as the executable path
• log a warning when the executable cannot be started
• add a regression test using an argument with spaces and a literal shell metacharacter

This is the first standalone slice extracted from #163, as requested in review.

Validation

• build completed successfully
• full CTest suite: 822/822 passed
• extractor and package-dependency Python tests: 45/45 passed
• README device table and Debian dependency drift checks passed
• local pre-push gate passed