feat(app): capture an account_deleted event on deletion completion

[posthog]

Note

Scope is narrower than the report. The report asks to port Postshow's account-deletion flow into a separate hub app, update its PrivacyPage.tsx §10.3, and add a completion event. Two of those three do not apply to this repository — details under Agent context. The one piece that is a genuine, verifiable gap here is the missing completion event, and that is all this PR changes.

What changed

• Fire track('account_deleted') once when a self-serve account deletion completes, right after the receipt is set, in AccountDeletionSection.
• Event carries no properties: no email, token, or receipt id — the taxonomy only needs the count of completions.
• Tests assert the event fires exactly once on success and not on the ownership-blocked failure path.

Why

• The Postshow app already ships the full self-serve deletion flow wired into /settings, but it emitted no analytics event on completion, so the project's event taxonomy had no account-deletion event at all.
• Result: real deletion demand can't be measured — the only visibility today is when someone writes in via feedback.
• This closes that measurability gap, which the report explicitly calls for ("capture an event on completion so we can finally see how often this is used").

Verification

• pnpm --filter @eventools/postshow test scope: npx vitest run src/components/settings/AccountDeletionSection.test.tsx → 6 passed
• pnpm type-check → clean
• pnpm lint → clean (--max-warnings 0)
• pnpm format:check on changed files → clean
• pnpm governance:check → passed

Safety and release impact

• Capture stays consent-gated (track() no-ops unless analytics consent is accepted), identical to every other event in the app. The event fires with the still-authenticated (about-to-be-deleted) user id, before sign-out, which is exactly what's needed to attribute a completion.

• No behavior change to the deletion itself: re-auth freshness, typed DELETE MY ACCOUNT confirmation, workspace-ownership guard, and downloadable receipt are untouched.

• Connector access remains read-only unless the user explicitly approves a supported outbound action.

• Credentials and private source records do not enter model prompts or hosted paths that are not explicitly documented.

• Local-only and tenant boundaries remain intact.

• Human approval still gates every outbound action.

• New dependencies and redistributed assets have compatible licenses and preserved notices. (none)

• Tests, documentation, and package metadata cover the changed behavior.

• The change contains no credentials, customer data, generated build output, or unrelated edits.

Agent context

The report describes fixing a hub app; the assigned repository is Postshow, the app the report itself cites as the reference implementation. Mapping the report's three solution items onto this repo:

Report item	State in this repo
Port the deletion flow into the hub's personal settings + a hub-side deletion function	Not applicable — there is no apps/hub in this repo, and no hub/feathub repo in the org. Postshow already ships the complete flow (re-auth freshness, typed confirmation, ownership guard, downloadable receipt) wired into /settings.
Update PrivacyPage.tsx §10.3 ("contact support / 30 days") to point at the in-app control	Already satisfied — Postshow's privacy policy §9 already documents in-app account deletion with support@eventools.io only as a fallback for cases that can't be completed in-product. There is no stale "email support to delete" text to update.
Capture an event on completion	Genuine gap — fixed here.

Fabricating an entire hub app has no basis in this codebase, so this PR is scoped to the one change that faithfully applies. No competing open PR, branch, or assigned issue was found for account deletion.

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