Full WiFi scan (backport of upstream 5351)

[softhack007]

As found in wled#5345:
fixes an arduino-esp32 v2.0.x bug: don't use quick scan (and use the first matching channel) but do a full scan instead.

Summary by CodeRabbit

• Bug Fixes
  • Improved WiFi scanning to automatically select the strongest available signal for more reliable wireless connections.

[coderabbitai]

📝 Walkthrough

Walkthrough

A conditional WiFi scan method is added to the setup routine that forces all-channel scanning on supported platforms. When not building for ESP8266 and ESP_IDF_VERSION_MAJOR is 4 or higher, the code calls WiFi.setScanMethod(WIFI_ALL_CHANNEL_SCAN) to ensure the device scans all available channels and selects the strongest signal during WiFi initialization.

Changes

Cohort / File(s)	Summary
WiFi Scan Configuration wled00/wled.cpp	Adds platform-specific WiFi scan configuration in setup via preprocessor guard, enabling all-channel scanning on supported ESP-IDF versions to optimize signal strength selection.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 All channels bright, we'll scan them through,
No weaker signals left to rue,
The strongest WiFi now we'll find,
A scanning quest, most perfectly designed! 📡✨

🚥 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 accurately describes the main change: introducing a full WiFi scan feature as a backport from upstream WLED, which matches the code change adding WiFi.setScanMethod(WIFI_ALL_CHANNEL_SCAN) to ensure comprehensive channel scanning.
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 docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch wifiscan_fix

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[softhack007]

looks ok in my tests.