- Replaced broken search.azlyrics.com URL
- Changed Request Headers to avoid bot detection

This pull requests addresses #2441 where AZLyrics provider was broken
and could not retrieve lyrics at all.

## How Has This Been Tested?
Tested running the provider directly with various songs. Although a more
thorough testing is suggested.

## Types of Changes

## Checklist
- [x] My code follows the code style of this project
- [ ] My change requires a change to the documentation
- [x] I have updated the documentation accordingly
- [x] I have read the [CONTRIBUTING](/docs/CONTRIBUTING.md) document
- [ ] I have added tests to cover my changes
- [x] All new and existing tests passed

# Title
<!--- Provide a general summary of your changes in the Title above -->

## Description
* Prevent duplicate m3u entries on detect_formats
* Prevent IndexError when attempting to create default named m3u file
with no playlist.

## Related Issue
#2446 
#2448 


## How Has This Been Tested?
todo: run m3u tests.

## Screenshots (if appropriate)

## Types of Changes
<!--- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (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 change)

## Checklist
<!--- Go over all the following points, and put an `x` in all the boxes
that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->
- [ ] My code follows the code style of this project
- [ ] My change requires a change to the documentation
- [ ] I have updated the documentation accordingly
- [ ] I have read the [CONTRIBUTING](/docs/CONTRIBUTING.md) document
- [ ] I have added tests to cover my changes
- [ ] All new and existing tests passed

…to dev

# Title
Remove Genius lyric header

## Description
As of Aug 2025, Genius has added a lyrics header div. Remove it if
present.
`<div data-exclude-from-selection="true"
class="LyricsHeader__Container-sc-5e4b7146-1 hFsUgC">`

## Related Issue
Resolves #2356

## Types of Changes
<!--- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [x] Bug fix (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 change)

## Checklist
<!--- Go over all the following points, and put an `x` in all the boxes
that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->
- [x] My code follows the code style of this project
- [ ] My change requires a change to the documentation
- [ ] I have updated the documentation accordingly
- [x] I have read the [CONTRIBUTING](/docs/CONTRIBUTING.md) document
- [ ] I have added tests to cover my changes
- [ ] All new and existing tests passed

Solved index errors on mypy in the AZLyrics provider

## Related Issue
<!--- This project only accepts pull requests related to open issues -->
<!--- If suggesting a new feature or change, please discuss it in an
issue first -->
<!--- If fixing a bug, there should be an issue describing it with steps
to reproduce -->
<!--- Please link to the issue here: -->

## Motivation and Context
<!--- Why is this change required? What problem does it solve? -->

## How Has This Been Tested?
Running mypy following CONTRIBUTING.md

## Screenshots (if appropriate)

## Types of Changes
<!--- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [x] Bug fix (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 change)

## Checklist
<!--- Go over all the following points, and put an `x` in all the boxes
that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->
- [x] My code follows the code style of this project
- [ ] My change requires a change to the documentation
- [ ] I have updated the documentation accordingly
- [x] I have read the [CONTRIBUTING](/docs/CONTRIBUTING.md) document
- [ ] I have added tests to cover my changes
- [ ] All new and existing tests passed