feat(import-window): implement drag, minimize, maximize, close + rename refs
- Add window management functions: applyWindowPositionAndSize,
initWindowFromSession, startWindowDrag, moveWindowDrag, endWindowDrag,
minimizeWindow, maximizeWindow, restoreWindow
- Wire window control button event listeners
- Rename openImportModal→openImportWindow, closeImportModal→closeImportWindow
- Update all element references from modal*→window* names
- Remove selectDescendantsButton references
- openImportWindow now calls initWindowFromSession on open
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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