fix: warm WSL before preflight in WSL-only backend mode

[UtkarshUsername]

What Changed

Warm WSL before the preflight probes, so the first wsl.exe invocation doesn't pay a cold-start penalty.

Why

preWarm was already called in the dual-backend mode but missing from the WSL-only mode. This adds it before runWslPreflight so both paths get the same warm-start behavior.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Low Risk
Single-line startup ordering change in desktop WSL configuration; no auth, data, or API surface changes.

Overview
WSL-only primary backend now calls wslEnvironment.preWarm with the saved distro in buildWslPrimaryConfig, immediately before resolveWslStartConfig (which runs runWslPreflight).

That matches the dual-backend path in DesktopWslBackend, where pre-warm already ran before readiness checks. The goal is to avoid paying WSL’s first wsl.exe cold-start cost during preflight and reduce transient “WSL not ready” failures on startup.

^{Reviewed by Cursor Bugbot for commit cf3a1c6. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

[!NOTE]

Warm WSL distro before preflight in WSL-only backend mode

In buildWslPrimaryConfig, calls wslEnvironment.preWarm with the configured distro before resolveWslStartConfig runs. This ensures the distro is ready before the preflight check executes in WSL-only backend mode.

^{Macroscope summarized cf3a1c6.}

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[macroscopeapp]

Approvability

Verdict: Approved

Single-line fix adding a preWarm call to WSL-only backend mode that already exists in the parallel WSL code path. The function is safe (bounded timeout, catches its own errors) and the fix has clear intent with minimal risk.

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