[1.4] Timeout extension pulls from last Docker progress

[joaoantoniocardoso]

Fixes #3078.

Axios timeout: 120000 on extension update is a wall-clock deadline from request start. A large or slow Docker pull still streams progress, but the UI aborts at two minutes with timeout of 120000ms exceeded (the install path had no timeout at all).

Cancel only after 120s with no new download bytes. install() uses the same idle watchdog so a hung pull does not sit forever, while a long pull that is still moving is left alone.

Test plan

DUT 192.168.0.124 (bluerobotics/blueos-core:1.4-dev), management eth0. Local frontend (BLUEOS_ADDRESS=http://192.168.0.124/) for the UI path.

• Repro: POST /kraken/v1.0/extension/update_to_version of bluerobotics.jupyter:0.2.0 with a 120s total client timeout while the stream was still delivering data (timeout of 120000ms exceeded, last chunk at ~128s)
• After the change: idle client on the same endpoint survived 142s with data still arriving (idle watchdog did not fire)
• Local frontend install of Cockpit Lite v1.19.0-beta.9 completed; no timeout banner
• Kraken lifecycle bluerobotics.cockpit:v1.19.0-beta.9: 177 passed, 0 failed; DUT restored to blueos-docs + major_tom

Leftover (not this PR): if Docker goes silent for >120s after the last pull line (e.g. deleting leftover tags), the UI can still idle-cancel while the backend finishes. Heartbeats on the kraken stream would cover that.

[github-actions]

Automated PR Review

0. Summary

• Verdict: LGTM

Replaces the axios wall-clock timeout: 120000 on the extension update path (and the previously-unbounded install path) with a shared idle watchdog that cancels only after 120s without a new onDownloadProgress chunk. Small, self-contained TS-only change in core/frontend/src/views/ExtensionManagerView.vue; the helper is reused by both update() and install() and cleaned up in the finally block via watchdog.stop(). axios and back_axios are already imported and the token API used (axios.CancelToken.source()) matches the version pinned in core/frontend/package.json (axios ^0.21.1).

No further comments, nice job 👍

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