Fix GPIO0 pin conflict detection when button is disabled

[Copilot]

On ESP8266, GPIO0 defaults to button input but cannot be reassigned to LED output even when the button is disabled. The pin conflict checker unconditionally flags all button GPIO pins as in-use regardless of button state.

Changes

• Modified pin conflict detection in settings_leds.htm to check button type before marking pin as used
• Button pins only conflict when button type is not "Disabled" (value != 0)
• IR and Relay pins remain unconditionally reserved

Implementation

Two instances of the conflict check were updated (in pinsOK() and UI() functions):

// Before: all button pins always conflict
d.Sf.querySelectorAll("select.pin").forEach((e)=>{
  if(e.value>-1) p.push(parseInt(e.value));
})

// After: only enabled buttons conflict
d.Sf.querySelectorAll("select.pin").forEach((e)=>{
  if(e.value>-1) {
    if (e.name.startsWith("BT")) {
      let btnTypeField = d.Sf["BE" + e.name.substring(2)];
      if (btnTypeField && btnTypeField.value != "0") {
        p.push(parseInt(e.value));
      }
    } else {
      p.push(parseInt(e.value));
    }
  }
})

Users can now set button type to "Disabled" or GPIO to "-1" to free the pin for LED use.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>ESP8266: GPIO0 can't be used as an output</issue_title>
<issue_description>### What happened?

GPIO0 always gets assigned to a button

To Reproduce Bug

Set GPIO0 as LED output

Expected Behavior

Save correctly

Install Method

Self-Compiled

What version of WLED?

0.16

Which microcontroller/board are you seeing the problem on?

ESP8266

Relevant log/trace output

Anything else?

No response

Code of Conduct

• I agree to follow this project's Code of Conduct</issue_description>

<agent_instructions>please find the reason GPIO0 always gets assigned to button. I susect an issue in settings_leds.htm </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes ESP8266: GPIO0 can't be used as an output #5258

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