Fix address_is_local to match .local case-insensitively

[bluetoothbot]

What does this implement/fix?

What: address_is_local() now lowercases the address before
checking the .local suffix.

Why: mDNS / DNS names are case-insensitive (RFC 6762 §16,
RFC 4343), but the previous endswith(".local") was case-sensitive.
A peer advertising itself as MyESP.LOCAL or myesp.Local was not
recognised as a local address, which then perturbs the log-name
composition in build_log_name() (the (not name and address_is_local(address)) branch never fires, so the host part
isn't lifted out as the friendly name).

How: One-character behavioural change — .lower() before
.endswith(".local"). Trailing-dot handling (removesuffix("."))
is preserved.

Testing: New parametrized test_address_is_local cases pin the
case-insensitive behaviour (commit 1 fails against the old code,
commit 2 makes them pass). Full suite: 1075 passed, 2 skipped.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code quality improvements to existing code or addition of tests
• Other

Related issue or feature (if applicable):

• Replaces Add tests for build_log_name and host predicates in util #1671 (originally a test-coverage PR; reframed here as the
  targeted bug fix that surfaced while writing those tests).

Pull request in esphome (if applicable):

• n/a — client-only change, no protocol or firmware-side impact.

Checklist:

• The code change is tested and works locally.
• If api.proto was modified, a linked pull request has been made to esphome with the same changes. (N/A — api.proto not touched.)
• Tests have been added to verify that the new code works (under tests/ folder).

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Quality Report

Changes: 2 files changed, 21 insertions(+), 2 deletions(-)

Code scan: clean

Tests: failed (FAILED)

Branch hygiene: clean

Generated by Kōan post-mission quality pipeline

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f544437) to head (cc0868f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1681   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           25        25           
  Lines         4152      4152           
=========================================
  Hits          4152      4152           

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[codspeed-hq]

Merging this PR will not alter performance

✅ 40 untouched benchmarks

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_{Comparing bluetoothbot:koan/address-is-local-case-insensitive (cc0868f) with main (f544437)}

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c9e9fe2e-0f1b-4c62-bfe5-caf5aba3b24f

📥 Commits

Reviewing files that changed from the base of the PR and between f544437 and cc0868f.

📒 Files selected for processing (2)

• aioesphomeapi/util.py
• tests/test_util.py

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Walkthrough

The PR updates the address_is_local() utility function to perform case-insensitive matching of the .local suffix for mDNS-style hostnames. The implementation change adds lowercasing to the normalized address, and comprehensive parametrized tests verify behavior across valid local domains, optional trailing dots, and rejection of non-local addresses.

Changes

Case-insensitive mDNS/local address detection

Layer / File(s)	Summary
Case-insensitive .local suffix check aioesphomeapi/util.py	address_is_local() now lowercases the normalized address before checking the .local suffix, enabling case-insensitive detection of local mDNS hostnames.
Local address detection tests tests/test_util.py	Import updated to include address_is_local, and new parametrized test test_address_is_local validates case-insensitive .local matching, trailing-dot handling, and rejection of non-local hostnames.

🎯 2 (Simple) | ⏱️ ~8 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Copilot]

Pull request overview

This PR fixes address_is_local() so it treats .local as case-insensitive (consistent with DNS/mDNS), ensuring mixed-case mDNS hostnames are correctly recognized as local and therefore can be used as the friendly name source in build_log_name().

Changes:

• Make address_is_local() lowercase the address before checking for the .local suffix (while preserving trailing-dot handling).
• Add unit tests covering .local case-insensitive behavior and trailing-dot variants.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
aioesphomeapi/util.py	Adjusts .local detection to be case-insensitive by lowercasing before the suffix check.
tests/test_util.py	Adds parametrized tests verifying case-insensitive .local recognition and existing edge cases.

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