Problem

When officecli fails to spawn (ENOENT — not installed), the pptPreview.start provider re-throws the error. Since the IPC bridge's subscribe() function calls provider callbacks without a .catch(), the thrown error becomes an unhandled promise rejection.

Sentry Issue: ELECTRON-CT — 144 events

Root Cause

ipcBridge.pptPreview.start.provider at pptPreviewBridge.ts:305 re-throws the caught error. The bridge's internal subscribe() calls callback(data).then(...) without .catch(), so any rejected promise becomes unhandled.

Fix

Return { url: '', error: message } from the provider instead of throwing. Update the renderer (PptViewer) to check for the error field and throw locally where it's properly caught.