Add event handling for the feed created event

[gpunto]

Goal

Continuing to add event handling, this time for FeedCreatedEvent.

Implementation

• Map WS event to StateUpdateEvent and handle where needed
• I also took the opportunity to move the filter check from the state to the handler

Testing

Testing manually would require creating a feed, which I don't think it's doable from the sample atm

Checklist

• Issue linked (if any)
• Tests/docs updated
• I have signed the Stream CLA (required for external contributors)

[github-actions]

PR checklist ✅

All required conditions are satisfied:

• Title length is OK (or ignored by label).
• At least one pr: label exists.
• Sections ### Goal, ### Implementation, and ### Testing are filled.

🎉 Great job! This PR is ready for review.

[Copilot]

Pull Request Overview

This PR adds event handling for the FeedCreatedEvent WebSocket event and refactors filter checking logic to improve maintainability. The key changes include mapping the WS event to a new StateUpdateEvent.FeedAdded and moving filter validation from state classes to event handlers.

• Introduces StateUpdateEvent.FeedAdded to handle feed creation events
• Moves filter matching logic from state implementations to event handlers
• Renames onFeedUpdated to onFeedUpserted to better reflect its upsert behavior

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
StateUpdateEvent.kt	Adds FeedAdded event and maps FeedCreatedEvent to it
FeedEventHandler.kt	Adds filter parameter and handles FeedAdded event; moves activity filter checks from state to handler
FeedListEventHandler.kt	Adds filter parameter and handles FeedAdded event with filter matching
FeedStateImpl.kt	Removes filter checks from onActivityAdded and onActivityUpdated
FeedListStateImpl.kt	Renames onFeedUpdated to onFeedUpserted and implements proper upsert logic
FilterMatch.kt	New utility file for filter matching with null-safe handling
List.kt	Generalizes upsertSorted ID selector from String to generic type
FeedImpl.kt	Passes activity filter to FeedEventHandler
FeedListImpl.kt	Passes feeds filter to FeedListEventHandler
TestData.kt	Makes createdAt parameter configurable in test data factory
FeedEventHandlerTest.kt	Adds test coverage for FeedAdded event and filter matching scenarios
FeedListEventHandlerTest.kt	Adds test coverage for FeedAdded event and updates existing tests
FeedStateImplTest.kt	Removes tests moved to handler level
FeedListStateImplTest.kt	Updates tests to reflect renamed method and upsert behavior

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[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-feeds-android-client	2.43 MB	2.43 MB	0.00 MB	🟢

[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
92.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud