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Fix paste-over-selection and add selection-aware improve and auto dark mode
- Paste (Ctrl+V) now replaces selected text instead of inserting at caret start, matching standard editor behavior
- Use WPF native SelectedText for paste/drop to preserve undo stack (Ctrl+Z)
- Ctrl+R with a selection improves only the selected text, leaving the rest unchanged
- Auto-detect Windows dark/light mode from system settings and apply matching theme