Summary

• restore the Memory window automatically on launch if it was open when the app last exited
• persist and restore the Memory window geometry across restarts
• centralize Memory window creation so reopen behavior is consistent from the menu and startup restore path

Root Cause

The Memory window did not persist its open/closed state, and its geometry was only transient. Because the dialog uses WA_DeleteOnClose and had no startup restore path, it always came back closed after relaunch and lost its previous position.

Validation

• confirmed the fix locally in the worktree
• user requested PR after verifying the fix is working