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### What changed? Made the mobile new-message directory providers (`relayDirectoryUsersProvider`, `relayDirectorySearchProvider`) `autoDispose`, and both now watch `relayConfigProvider` so they refetch when the active relay/community configuration changes. ### Why? Follow-up to #2810 (Codex P1 review flag: "Invalidate the directory when the community changes"). Both providers previously cached results for the whole app session. They watched only the relay-session notifier (a stable instance that survives dependency rebuilds) and the current pubkey, which keeps its value when two communities share a signing key. Switching between such communities could reopen the New message sheet showing the previous relay's people, and submit their pubkeys to the current relay. The search provider was also a non-autoDispose family keyed by raw query strings, so every distinct typed query leaked a cached provider entry for the session. Watching `relayConfigProvider` (which rebuilds on every community switch via `activeCommunityProvider`) invalidates cached browse and search results at the community boundary, and `autoDispose` releases the cache when the sheet closes. ### How is it tested? Full mobile suite green (585 passed / 1 skipped), `flutter analyze` clean. Added tests: - [`channel_management_provider_test.dart`](https://github.com/block/buzz/blob/gated/directory-provider-invalidation/mobile/test/features/channels/channel_management_provider_test.dart) — browse and search refetch on relay-config change with an unchanged session notifier and pubkey; cached search families are released once unlistened. Signed-off-by: npub1kqarnt4re38nuttqnml3mrqp8cnm6wzpywl2kesc2ejasp0luc5q275nkx <b03a39aea3cc4f3e2d609eff1d8c013e27bd384123beab66185665d805ffe628@buzz.block.builderlab.xyz> Co-authored-by: npub1kqarnt4re38nuttqnml3mrqp8cnm6wzpywl2kesc2ejasp0luc5q275nkx <b03a39aea3cc4f3e2d609eff1d8c013e27bd384123beab66185665d805ffe628@buzz.block.builderlab.xyz>