fix(frontend): handle transient network failures on downloadUrl path

[posthog-eu]

Summary

Two error-tracking issues turned out to be one thing: a transient browser network drop on the downloadUrl path, worded differently per engine.

• Who it hurts: on the bundle page, a user clicks open/test, the network blips, and they get nothing — no download, no error toast. The TypeError threw out of downloadUrl (supabase.ts) and escaped unhandled at the bundle-page call site, skipping straight past the cannot-get-the-test- toast written for exactly this case.
• Noise: the same family (Chrome Failed to fetch, WebKit Load failed, Firefox NetworkError when attempting to fetch resource., Edge, …) minted a fresh unhandled issue per browser dialect because nothing in before_send matched it.

Mechanism of the fix:

Change	File	Effect
Rethrow the raw TypeError untouched; wrap only non-TypeError causes (with cause)	src/services/supabase.ts	transient-network detection can still recognise the message
Catch the downloadUrl call in openVersion	src/services/versions.ts	failure lands in the existing cannot-get-the-test- toast instead of dead-ending
await openVersion(...) at the call site	src/pages/app/[app].bundle.[bundle].vue	the rejection is handled, not floated
Add anchored transient-network patterns + suppress in before_send	src/services/staleAssetErrors.ts	the family stops minting a new issue per engine

Note

Patterns are anchored (^(?:.*: )?…$) so only the standalone browser message (optionally wrapped as downloadUrl error: …) is suppressed — richer messages like Failed to fetch organization insights are left alone.

Test plan

• npx vitest run tests/stale-asset-errors.unit.test.ts — extended to cover the transient-network matcher (raw + wrapped forms), the non-matches, and end-to-end suppression via shouldSuppressPostHogExceptionEvent. All pass.
• Lint + vue-tsc typecheck clean on the touched files.

Screenshots

n/a — the observable change is that a network blip now shows the existing "cannot get the test" toast instead of silently doing nothing.

Checklist

• My code follows the code style of this project and passes lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• My change has adequate E2E test coverage.
• I have tested my code manually, and I have provided steps how to reproduce my tests.

Agent context

Not covered by open PR #2891: that adds retries to invokeCapgoApi (src/services/capgoApi.ts), but downloadUrl uses raw fetch and never goes through it, so this work does not overlap.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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