Fix Windows helper updates while running#86
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What
Fixes native helper updates on Windows when the existing helper executable is still running by moving the locked binary aside before writing the replacement.
Keeps macOS/Linux on the direct copy path, adds replacement tests, and shows Windows users a browser-restart hint after updates.
Why
Closes #84
How to Test
cd host && go test ./...cd host && GOOS=windows GOARCH=amd64 go test -c -o /tmp/tailchrome-host-windows.test .pnpm -r typecheckpnpm -r testChecklist