esbuild was emitting preload.js as ESM (format:"esm"), but Electron
loads preload scripts via its sandboxed Node context, which is CJS.
With an ESM preload, the contextBridge.exposeInMainWorld calls
silently no-op, leaving window.fusionShell / window.fusionAPI
undefined in the renderer — which is why the dashboard always fell
through to "Can't reach the Fusion backend" and DesktopLaunchGate
always logged "window.fusionShell unavailable; bypassing".
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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