Fix-it actually fixes, install stops looping, dropdown gets smarter

Highlights

• · 'Fix it now' actually heals mirrored networking mode. If your Linux environment is stuck in the wrong networking mode (common if Docker Desktop or other tools configured WSL before SpawnBox touched it), the button now strips the bad config, restarts WSL, and gets you back to a working state. Works from the first-run wizard AND the live daemon status dropdown
• · No more reboot loop on machines that already had WSL2. The setup flow used to misread Microsoft's own WSL1 compatibility message as a real error and keep asking you to restart. Now it actually checks whether the kernel is loaded and moves on
• · Our own health check no longer kills the Linux environment mid-install. A background probe was pinging external hosts while your distro was still being imported, and a failed ping was terminating the distro. Removed. Installs go through to completion now
• · Daemon status dropdown auto-expands when a service needs your attention, instead of making you click to find out what's wrong. The 'Fix it now' button lives inside the expanded panel, so a collapsed dropdown was hiding the actionable part. Also widened the dropdown layout so the fix-it messaging is readable without line breaks
• · In-game Discord chat relay is more reliable: when Discord rate-limits us, the relay now backs off cooperatively (honors the Retry-After hint) instead of hammering and getting throttled harder. Also skips polling entirely when no server has Discord chat enabled - quieter and cheaper when the feature isn't in use