fix: remove obsolete header file in DSReachabilityManager (iOS 26)

[HashEngineering]

Issue being fixed or feature implemented

What was done?

How Has This Been Tested?

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

Summary by CodeRabbit

• Chores
  • Optimized internal dependencies with no impact to functionality or user experience.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 4aaffb65-475a-4827-b714-fceec39d54ba

📥 Commits

Reviewing files that changed from the base of the PR and between 9d962f2 and 3112666.

📒 Files selected for processing (1)

• DashSync/shared/Libraries/DSReachabilityManager.m

💤 Files with no reviewable changes (1)

• DashSync/shared/Libraries/DSReachabilityManager.m

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📝 Walkthrough

Walkthrough

Removed an unused netinet6/in6.h header import from DSReachabilityManager.m. No functional changes, logic modifications, or public interfaces were altered.

Changes

Cohort / File(s)	Summary
Import Cleanup DashSync/shared/Libraries/DSReachabilityManager.m	Removed unused #import <netinet6/in6.h> dependency.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A header unused, now cast away,
One line removed, the code runs light,
Less baggage carried through the day,
Dependencies trimmed, the project's bright!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: removing an obsolete header file from DSReachabilityManager, which matches the changeset that removes the #import <netinet6/in6.h> dependency.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/ios-26

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