fix(launch): disable floating webcam preview without passthrough

[meiiie]

Description

Disable the floating webcam preview when the HUD overlay cannot support mouse passthrough.

Motivation

Issue #320 reports that enabling the floating webcam preview on Windows 10 makes the desktop unusable outside the HUD. The problem is that the recording HUD expands to the full viewport for the draggable preview, but Windows 10 currently falls back to a non-passthrough overlay window.

Root Cause

When showRecordingWebcamPreview is enabled, the renderer reports a full-viewport HUD size so the floating preview can be dragged anywhere on screen. On platforms where isHudOverlayMousePassthroughSupported() is false, that turns the transparent HUD overlay into a fullscreen click blocker.

Changes

• expose HUD mouse passthrough support to the renderer
• only render the floating webcam preview when passthrough support is available
• hide the floating preview toggle when the platform cannot safely support it
• add focused helper tests for the gating logic

Related Issue(s)

• [Bug]: When camera overlay is enabled in Windows, the desktop is obscured. #320
• fix(launch): keep HUD interactive after short drags #300

Testing Guide

• node ./node_modules/vitest/vitest.mjs run src/components/launch/floatingWebcamPreview.test.ts
• node ./node_modules/typescript/bin/tsc --noEmit
• node ./node_modules/@biomejs/biome/bin/biome check electron/windows.ts electron/preload.ts electron/electron-env.d.ts src/components/launch/LaunchWindow.tsx src/components/launch/floatingWebcamPreview.ts src/components/launch/floatingWebcamPreview.test.ts

Notes

This keeps the existing floating preview behavior on platforms where HUD passthrough is supported, while falling back to the non-floating webcam controls on platforms where a fullscreen transparent overlay would block the desktop.

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