docs: update PROJECT_STRUCTURE.md to reflect current codebase

[William-Laverty]

Summary

Closes #90

Updates the project structure documentation to accurately reflect the current source files.

Changes

1. Consolidated duplicate PROJECT_STRUCTURE.md files

• Removed /MiddleDrag/PROJECT_STRUCTURE.md (outdated subset)
• Root PROJECT_STRUCTURE.md is now the canonical version

2. Added missing source files to documentation

Core/

• TouchDeviceProviding.swift - Protocol for touch device abstraction

Managers/

• AccessibilityMonitor.swift - Monitors accessibility permission state
• AccessibilityWrappers.swift - Wrappers for accessibility API interactions

Utilities/

• ScreenHelper.swift - Screen and display utilities
• SystemGestureHelper.swift - System gesture coordination
• UpdateManager.swift - Handles Sparkle auto-updates
• WindowHelper.swift - Window management utilities

3. Updated the Tests section

Updated from 3 test files to all 17 current test files, including the Mocks directory.

4. Removed ghost reference

Removed mention of .github/copilot-instructions.md (file doesn't exist)

5. Cleaned up stale files

• Removed empty /LEARN.md
• Removed /MiddleDrag/README.md (duplicated root README with outdated macOS version)

[Copilot]

Pull request overview

This PR updates the project structure documentation to accurately reflect the current codebase, addressing issue #90. It consolidates duplicate documentation files, adds missing source files to the documentation, and cleans up stale files.

Changes:

• Added 7 previously undocumented source files to PROJECT_STRUCTURE.md (TouchDeviceProviding, AccessibilityMonitor, AccessibilityWrappers, ScreenHelper, SystemGestureHelper, UpdateManager, WindowHelper)
• Expanded test documentation from 3 to all 17 test files including the Mocks directory
• Removed duplicate/outdated files: MiddleDrag/PROJECT_STRUCTURE.md, MiddleDrag/README.md, and empty LEARN.md
• Removed ghost reference to non-existent .github/copilot-instructions.md

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
PROJECT_STRUCTURE.md	Added missing Core/, Managers/, and Utilities/ files; expanded Tests section to list all 17 test files; removed ghost reference to copilot-instructions.md; updated architecture benefits to mention comprehensive test coverage
MiddleDrag/PROJECT_STRUCTURE.md	Removed duplicate/outdated version of project structure documentation
MiddleDrag/README.md	Removed duplicate README with outdated macOS version requirement (14.0 vs 15.0)
LEARN.md	Removed empty file

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[NullPointerDepressiveDisorder]

Great work! 😄

[NullPointerDepressiveDisorder]

Thanks for the contribution @William-Laverty! 🎉
I merged this manually after resolving some conflicts with recent changes to main. For future PRs, if you see a "This branch has conflicts" message, you can resolve it by rebasing your branch on the latest main:

git fetch upstream
git rebase upstream/main
# resolve any conflicts, then:
git push --force-with-lease

(Replace upstream with origin if you're working on a direct clone rather than a fork)
Appreciate the cleanup work on the project structure docs!