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FH-4.7 - AccountIdentitiesComponent under features/website/account/identities/. Lists linked identities from GET /me/identities, offers attach buttons only for OAuth providers not already linked (reusing SocialLoginButtonComponent), detaches through unlink(). Refuses to detach the last remaining identity - it is the only way back in - with the control disabled and an explanatory title, matching the backend's last-identity 409. Loading / error / ready states; a load failure surfaces an error rather than rendering an empty account, and a slot carries the identity-conflict message from PHASE-8 §2.3. 6 unit tests. Not wired into a route: the storefront has no customer account area yet and no live OAuth application to authorize against (FH-0.1). This is the surface both depend on, buildable and tested now. FH-4.6 (client + contract) - the gateway now separates the two provider sets. SocialProvider (vk | yandex) is what has an OAuth authorize redirect; ExternalIdentityProvider (adds telegram | max) is what can be listed and unlinked. unlink() widened to the latter so Telegram detaches through the same path as VK, with no second code path. The dev local gateway seeds a Telegram identity so the linking screen is exercisable before any real provider exists. PHASE-8 §2.6 specifies the backend migration: a Telegram login writes an ExternalIdentity row under the same uniqueness and identity-conflict rule as VK, appears in /me/identities, is removable subject to the last-identity 409, and keeps customer (marketplace_session) and admin (bo_session) sessions as distinct cookies - closing the shared customer/admin Telegram session the audit flagged. The identity row and the messaging BotConversationBinding stay separate records. FH-4.8 - PHASE-8 §3 now states email/phone OTP's position explicitly: recovery when a linked messenger is unreachable and an addable second factor, never the primary login, and one more identity on the same customer rather than a parallel account. 262 tests pass. Build green, boundaries and cycles green, bundle scan clean. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>