fix(users): invalidate recommended stream cache on follow

[infin1t3]

Clear the recommended:all:all user stream from IndexedDB when a user is followed so the Who to Follow card shows fresh suggestions on next mount.

Made-with: Cursor

[infin1t3]

@greptileai review

[greptile-apps]

Greptile Summary

This PR adds a targeted cache invalidation for the recommended:all:all user stream (Core.UserStreamTypes.RECOMMENDED) in IndexedDB whenever a follow action is performed. The fix ensures the "Who to Follow" card shows fresh suggestions on the next mount instead of re-displaying users the viewer has just followed.

• The change is minimal and well-scoped: four lines inside updateUserStreams, guarded by isFollowing === true, pushed into the existing ops array and executed via Promise.all alongside other stream operations.
• The correct service method (LocalStreamUsersService.deleteById) and enum constant (UserStreamTypes.RECOMMENDED = 'recommended:all:all') are used consistently with the rest of the codebase.
• The approach mirrors the existing timeline stream invalidation pattern (invalidateTimelineStreams) already present in the same method.
• No layer boundary violations: both LocalFollowService and LocalStreamUsersService live in the services/local layer, and services calling sibling local services is already the established pattern here (e.g. LocalStreamPostsService.deleteById in invalidateTimelineStreams).

Confidence Score: 5/5

• Safe to merge — the change is minimal, correct, and consistent with existing cache-invalidation patterns.
• No P0 or P1 issues found. The four-line addition uses the correct service, the correct enum constant, runs in the established Promise.all ops array, and mirrors the existing timeline stream invalidation pattern. No layer boundary violations, no dead code, no linter suppressions.
• No files require special attention.

Important Files Changed

Filename	Overview
src/core/services/local/follow/follow.ts	Adds four-line cache invalidation for the recommended:all:all user stream when a follow action is performed, ensuring fresh suggestions on next mount of the Who to Follow card.

Sequence Diagram

sequenceDiagram
    participant UI as UI / Controller
    participant LFS as LocalFollowService
    participant LSUS as LocalStreamUsersService
    participant LSPS as LocalStreamPostsService
    participant IDB as IndexedDB

    UI->>LFS: create({ follower, followee, activeStreamId })
    LFS->>IDB: transaction(rw) — update connections, counts, relationships
    IDB-->>LFS: committed
    LFS->>LFS: updateUserStreams({ isFollowing: true, ... })
    par Follow stream ops
        LFS->>LSUS: prependToStream(follower:following, [followee])
        LFS->>LSUS: prependToStream(followee:followers, [follower])
        LFS->>LSUS: deleteById("recommended:all:all")  ← new
        LFS->>LSPS: deleteById(timelineStreamId)
    end
    LSUS->>IDB: delete "recommended:all:all" cache
    LSPS->>IDB: delete timeline stream cache
    IDB-->>LFS: done
    LFS-->>UI: resolved
    Note over UI,IDB: Next mount of Who to Follow card<br/>finds no cache → fetches fresh from Nexus

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_{Reviews (1): Last reviewed commit: "Merge branch 'dev' into fix/1224-who-to-..." | Re-trigger Greptile}

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