pastilhasandClaude Opus 5
2ef4efd39b
Found by breaking it. Installing a sidecar that was already configured replaced its connection row with the new install's, silently repointing a working service somewhere else — during testing that took the live Transmission from :9091 to a scratch container on :18092, and the only symptom was that it stopped working. Install now blocks instead of overwriting, naming both URLs and offering the choice. Blocked rather than failed because there is a sensible answer and the user is the only one who has it: keep what is there, or reinstall with `replaceConnection` to change it deliberately. Harmless on a fresh machine; this is entirely for the one with an existing setup. Verified against the live row: an install pointed at a different URL is refused and the original connection is still there afterwards. Also makes "do you already have one?" structural rather than a UI convention. Three tests: anything that can provision must also offer `existing`, `existing` must come first in `modes` since that is the order the prompt uses, and it must ask for a URL. A new entry added later cannot quietly offer only "provision one for me" — which is how someone with a working Immich ends up with a second one and finds out when two libraries disagree. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>