This commit addresses critical UI responsiveness issues caused by blocking
the Event Dispatch Thread (EDT) during long-running operations.

## Critical Issue 1: ProjectControllerImpl Synchronous Execution

### Problem
- LongTaskExecutor was configured for synchronous execution (doInBackground=false)
- Project operations (open, save, duplicate) blocked the calling thread
- Broad synchronized blocks caused unnecessary lock contention

### Solution
- Changed LongTaskExecutor to async mode: new LongTaskExecutor(true, "ProjectController", 10)
- Refactored openProject() to be non-blocking, returning null immediately
- Refactored duplicateWorkspace() to be non-blocking
- Refactored saveProject() with proper async pattern
- Moved synchronized blocks inside lambdas to only lock during state updates
- Callers should use ProjectListener callbacks for completion notification

## Critical Issue 2: Excessive SwingUtilities.invokeAndWait() Usage

### Problem
invokeAndWait() blocks the calling thread until EDT completes the runnable,
causing UI freezes when called from background threads or during initialization.

### Files Fixed

1. **ReportPanel.java & ProcessorIssuesReportPanel.java**
   - Changed: Use invokeLater() for deferred UI initialization when not on EDT

2. **EditWindowControllerImpl.java**
   - Changed: Added AtomicBoolean cache for isOpen() state
   - Changed: Use invokeLater() instead of invokeAndWait() for state queries

3. **DefaultDataTablesEventListenerBuilder.java**
   - Changed: Added AtomicReference cache for DataTablesEventListener
   - Changed: Cache the component reference after first lookup

4. **DesktopImportControllerUI.java**
   - Changed: Added explicit EDT checks before invokeAndWait calls

5. **ScreenshotTask.java**
   - Changed: Use CompletableFuture with invokeLater() for file chooser dialog

6. **UIUtils.java**
   - Changed: Added EDT checks to avoid unnecessary invokeAndWait calls
   - Changed: Added proper Thread.interrupt() handling

## Test Updates

- Updated ProjectControllerImplTest to use CountDownLatch for async operations
- Tests now properly wait for ProjectListener callbacks before assertions

## Breaking Changes

- openProject(File) now returns null (async) - use ProjectListener.opened()
- duplicateWorkspace(Workspace) now returns null (async) - workspace auto-selected