Make code rust 1.87.0 compatible

[edenhaus]

Needed until HA armv6 is deprecated. See https://github.com/home-assistant/core/actions/runs/18808127691/job/53665385561 as the wheels builder is using alpine 3.22, which is shipped with rust version 1.87.0 but the code required at least 1.88.0

[Copilot]

Pull Request Overview

This PR updates the codebase to be compatible with Rust 1.87.0 by refactoring let-chain syntax patterns that are no longer supported in the newer compiler version. The changes convert chained let-if conditions into nested if-let statements.

• Replaced let-chain patterns with nested if-let statements for Rust 1.87.0 compatibility
• Added clippy allow annotation to suppress warnings about collapsible if statements

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[Copilot]

[nitpick] This nested if structure could be simplified by inverting the condition: if let Some(entries) = self.data.get(&map_info_type) && !entries.is_empty() would be more readable. However, since the PR description indicates this change is for Rust 1.87.0 compatibility, consider adding a comment explaining why the let-chain pattern was replaced, to prevent future refactoring back to the original style.

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.47%. Comparing base (72d11d7) to head (a66629f).
⚠️ Report is 1 commits behind head on dev.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/map/map_info.rs	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1265      +/-   ##
==========================================
- Coverage   94.50%   94.47%   -0.04%     
==========================================
  Files         148      148              
  Lines        5641     5643       +2     
  Branches      349      349              
==========================================
  Hits         5331     5331              
- Misses        249      251       +2     
  Partials       61       61              

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[codspeed-hq]

CodSpeed Performance Report

Merging #1265 will not alter performance

_{Comparing rust-1.87.0-compatibility (a66629f) with dev (72d11d7)}

Summary

✅ 9 untouched