Persist deck selection and checkbox states in sync UI

[Copilot]

Users must re-select deck and checkbox settings each time they open the LingQ sync dialog.

Changes

Config persistence

• Added lastDeck, lastImportKnowns, lastDowngradeLingqs fields to config.json
• Implemented getter/setter methods in Config.py with proper type annotations

UI behavior

• Dialog restores last deck selection (if deck exists) and checkbox states on open
• Settings saved to config when user clicks Import or Sync

Testing

• Added 6 tests covering new config methods (42 total tests passing)

# Config.py
def GetLastDeck(self) -> str:
    return self._GetConfig("lastDeck")

def GetLastImportKnowns(self) -> bool:
    value = self.config.get("lastImportKnowns", False)
    return bool(value)

# popUpWindow.py - Restore on dialog open
lastDeck = self.actionHandler.GetLastDeck()
if lastDeck:
    index = self.deckSelector.findText(lastDeck)
    if index >= 0:
        self.deckSelector.setCurrentIndex(index)

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