Add sanity checks for ethernet config table and WLED_ETH_DEFAULT

[softhack007]

Small helper for integrators by compile-time sanity checks:

• WLED_NUM_ETH_TYPES is aligned with the boards table
• WLED_ETH_DEFAULT is aligned with the boards table

Can be merged into 17.0.0, 16.0.0, and 0.15.x branch

Summary by CodeRabbit

• Chores
  • Added compile-time validation for Ethernet configuration settings to ensure configuration consistency.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Run ID: 65e84d03-2540-49aa-be5a-e7520db9b1bb

📥 Commits

Reviewing files that changed from the base of the PR and between 4ba60a6 and e645892.

📒 Files selected for processing (1)

• wled00/network.cpp

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Walkthrough

This PR adds compile-time sanity checks to the Ethernet configuration in wled00/network.cpp. Two static_assert statements verify that the ethernetBoards[] array length matches the WLED_NUM_ETH_TYPES count and that WLED_ETH_DEFAULT, if defined, falls within the valid enum range.

Changes

Ethernet Configuration Validation

Layer / File(s)	Summary
Static assertion checks for Ethernet configuration wled00/network.cpp	Two static_assert statements verify that ethernetBoards[] size matches WLED_NUM_ETH_TYPES and that WLED_ETH_DEFAULT is within the valid enum range [WLED_ETH_NONE, WLED_NUM_ETH_TYPES).

Possibly related PRs

• wled/WLED#5156: Expands WLED_NUM_ETH_TYPES and adds a new entry to ethernetBoards[], directly affected by the new compile-time checks.
• wled/WLED#5553: Adds two new Ethernet entries and increases WLED_NUM_ETH_TYPES, values that these new validation checks enforce.

Suggested labels

enhancement

Suggested reviewers

• DedeHai

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🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding compile-time sanity checks for the Ethernet configuration table and WLED_ETH_DEFAULT constant, which matches the file modifications described.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[softhack007]

tested locally, does what it should 👍