fix: harden Horizon SSE stream handling

[overcat]

No description provided.

[Copilot]

Pull request overview

Refactors Horizon SSE streaming to use OkHttp’s public EventSources factory instead of the internal RealEventSource, reducing reliance on OkHttp internal APIs.

Changes:

• Remove okhttp3.internal.sse.RealEventSource usage/import.
• Create SSE streams via EventSources.createFactory(okHttpClient).newEventSource(...).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.01%. Comparing base (6df16f8) to head (9e8b3a9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #791      +/-   ##
============================================
+ Coverage     81.42%   83.01%   +1.58%     
- Complexity     1473     1488      +15     
============================================
  Files           220      220              
  Lines          5530     5529       -1     
  Branches        568      568              
============================================
+ Hits           4503     4590      +87     
+ Misses          717      616     -101     
- Partials        310      323      +13     

Files with missing lines	Coverage Δ
.../main/java/org/stellar/sdk/requests/SSEStream.java	81.55% <100.00%> (+81.55%)	⬆️

... and 1 file with indirect coverage changes

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[Copilot]

Pull request overview

This PR refactors Horizon SSE streaming to use OkHttp’s public SSE API (EventSources) instead of relying on OkHttp’s internal RealEventSource, and adds focused tests to validate streaming, reconnect, and failure behaviors.

Changes:

• Switch SSE stream creation to EventSources.createFactory(okHttpClient).newEventSource(...).
• Force SSE requests to bypass caches via CacheControl.FORCE_NETWORK.
• Add a comprehensive SSEStreamTest suite covering parsing, resume behavior, and failure propagation.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/main/java/org/stellar/sdk/requests/SSEStream.java	Uses OkHttp public SSE factory and forces network (no-cache) for streaming requests; clarifies liveness behavior.
src/test/kotlin/org/stellar/sdk/requests/SSEStreamTest.kt	Adds MockWebServer-based tests for SSE event parsing, reconnect/resume, and failure handling.
CHANGELOG.md	Notes the fix/refactor in the Pending section.

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