fix: prevent setInterval memory leak in setEffectParameters()

[yazdan-iot]

The setInterval() call was inside setEffectParameters() which runs frequently. Each call created a new interval without clearing the previous one, causing a memory leak.

Now the interval ID is stored in _selFxInterval and cleared before creating a new interval.

Summary by CodeRabbit

• Bug Fixes
  • Improved effect selection updates by preventing overlapping timers.
  • Ensured the selected effect position refreshes reliably at regular intervals.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 2a6a63b0-b2f0-48a6-84df-11187da75ddc

📥 Commits

Reviewing files that changed from the base of the PR and between bc2c80d and d02c902.

📒 Files selected for processing (1)

• wled00/data/index.js

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Walkthrough

The effect-position updater now stores its interval ID, clears any existing interval, and starts a new 750ms interval on each update.

Changes

Effect-position timer management

Layer / File(s)	Summary
Manage effect-position interval wled00/data/index.js	Adds _selFxInterval and uses it to clear and replace the selected-effect-position update interval.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 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 fix: preventing a setInterval leak in setEffectParameters().
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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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