Release 3.0.0 — modern English UI and manual score reconstruction

[brucerc94]

Summary

This release replaces the legacy monolithic Tkinter application with a modular Qt 6 + QML desktop workflow focused on reconstructing on-screen sheet music.

Highlights

• Modern Qt 6 + QML interface, fully translated to English.
• YouTube and local video sources, including drag-and-drop.
• Manual frame selection for moving sheet music.
• Per-join overlap controls with conservative automatic estimation.
• Manual page cuts with direct visual editing.
• Fixed A4 PDF pagination for reconstructed score systems.
• Background processing, progress reporting, and actionable errors.
• No administrator privileges required.
• Pytest coverage and GitHub Actions CI.
• Public-release documentation, changelog, and MIT license.

Removed

• Motion-tracking correction toggle.
• Moving-highlight/overlay removal.
• Legacy administrator launch scripts and permission workarounds.
• The old monolithic ExtracorPartituras.py implementation.

Validation

The branch is ahead of main without divergence. Merge this pull request with squash to keep main history clean.

Note: Qt/QML and Windows executable behavior should still be verified on a Windows development machine before publishing the release binary.