v0.5.2

Bug Fixes

• Fix tab switch focus loss — switching tabs now properly blurs the old tab and focuses the new tab's editor/results, preventing silent input loss
• Fix reconnect resource leak — reconnecting now cancels in-flight queries, closes streaming iterators, and clears execution state before closing the old connection
• Fix quit resource leak — Ctrl+Q now cancels queries and closes iterators before exiting
• Fix connection manager File field — added missing File input to the connection manager form so sqlite/duckdb file paths are preserved on edit/save
• Fix status bar stale timer — ClearStatusMsg now carries a generation counter so older timers don't prematurely clear newer messages