Operate without Tidal client ID & secret

[estevaom]

Description

Allows Trackwatch to operate without Tidal client ID & secret

Fixes #2

Type of change

• New feature (non-breaking change which adds functionality)
• Documentation update

How Has This Been Tested?

Test Configuration:

• OS: [e.g. Arch Linux x86_64 6.15.8-arch1-1]
• Rust version: 1.88.0 (6b00bc388 2025-06-23)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[Copilot]

Pull Request Overview

This PR enables Trackwatch to function without requiring Tidal API credentials, making the Tidal integration optional while maintaining full functionality using playerctl metadata.

• Modified configuration to treat Tidal credentials as optional rather than required
• Updated the main application logic to gracefully handle missing Tidal provider
• Enhanced documentation to clarify that Tidal integration is optional

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/config.rs	Changed Tidal credentials from required to optional fields and added helper method
src/main.rs	Updated to conditionally create Tidal provider and handle missing credentials gracefully
README.md	Updated documentation to emphasize optional nature of Tidal integration
coverage_summary.py	Removed coverage summary script (cleanup)

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/main.rs	0.00%	4 Missing ⚠️

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