Fix ListBox drag-to-DAW, audio preview error feedback, and import filename preservation

[Copilot]

Three bugs in the Library tab: drag-to-DAW never initiates, audio preview fails silently, and imported files are renamed with a timestamp instead of keeping their original name.

Drag-and-drop (root cause)

LibraryListBox overrode mouseDown/mouseDrag/mouseUp directly on the ListBox subclass. JUCE routes all row interactions through an internal ContentComponent (nested child of ListViewport), so those overrides never fire for row events — dragRow_ was permanently -1.

Fix: Replace the three overrides with a DragHelper : public juce::MouseListener registered via addMouseListener(&dragHelper_, true). The true flag captures events from all nested descendants. Coordinates are translated with e.getEventRelativeTo(&lb_) before calling getRowContainingPosition(). Drag is initiated via the static DragAndDropContainer::performExternalDragDropOfFiles() directly — no fragile parent-container lookup.

// Before: overrides on ListBox that JUCE never calls for row events
void LibraryListBox::mouseDrag(const juce::MouseEvent& e) {
    auto* container = juce::DragAndDropContainer::findParentDragContainerFor(this);
    if (container && container->performExternalDragDropOfFiles(...)) { ... }
}

// After: listener that receives events from the internal ContentComponent
void LibraryListBox::DragHelper::mouseDrag(const juce::MouseEvent& e) {
    // ...
    juce::DragAndDropContainer::performExternalDragDropOfFiles(
        juce::StringArray(path), false, &lb_);
    dragStarted_ = true;
}
// Registered in constructor:
addMouseListener(&dragHelper_, true);

Audio preview error feedback

previewLibraryEntry() was void and failed silently on bad format or missing file. Changed to return bool; onPreviewClicked() now calls showFeedback("Preview failed…") on failure.

Import filename preservation

importAudioFile() renamed every imported file to import_YYYYMMDD_HHMMSS.ext. Fixed to use the original filename, appending _N (capped at 1000) only on collision.

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