shell.openPath always resolves on the Electron side, but if the Svelte
renderer navigates before the IPC reply arrives, the promise rejects
with 'reply was never sent'. The file is already open at that point.
Catch the rejection and treat it as success on both call sites (Step 4
primary path and Step 7 fallback). This eliminates the unhandled
promise error without masking real failures.
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