c043897b0e
Review follow-ups on #1304. SIGNING_KEY_UNREADABLE. USAGE_ENCRYPTION_KEY defaults to JWT_SECRET, so rotating JWT_SECRET — the correct response to a suspected compromise — makes the stored Ed25519 key undecryptable. That surfaced as a generic DELIVERY_FAILED which retried forever, and it silently blocks the DELETE packet too: an operator who withdraws has their local state cleared while the collector keeps its copy. decrypt() now tags its own failure and deliver() reports it under its own name, without flagging an identity conflict — an unreadable key is not evidence of a clone. The docs already warned that losing the key breaks deletion signing; they now name the trigger and the error. The collector default is no longer an inline string in the constructor. It is a declared DEFAULT_COLLECTOR_URL, since it is a deployment choice: self-hosters point USAGE_COLLECTOR_URL at their own collector and the UI already derives every link from whatever is configured. schema.cjs is deliberately untouched — it is vendored byte-identical with picpeak-usage, and its $id is a schema identity, not a delivery address. Links in the consent dialog. It named the collector inside prose but never linked it, so an operator deciding whether to opt in could not open the destination or the public schema without retyping a URL. Both are links now, built from the configured collector. UI standards. The tab hand-rolled its surfaces as `<section className="rounded-xl border border-theme …">` and imported Button from a deep path; every other settings tab uses `<Card padding="md">` from the components/common barrel. Converted, with the feedback <form> wrapped rather than replaced so its semantics survive, and headings given the same colour tokens as ImageSecurityTab. The barrel pulls ErrorBoundary -> i18n/config, so the tab's test needed the initReactI18next shim the FaceRecognitionCard test already uses. Not changed: the delete packet reusing the current sequence. The collector handles delete before any sequence check — "possession proof is sufficient for deletion, including when a restored backup has a stale sequence" (picpeak-usage server/collector.js) — so deletion is deliberately sequence-exempt and the client is correct as written. Refs #1110