Detector now walks each AXWindow subtree independently and returns
both aggregate signals (for state machine) and a list of AXWindow
element refs for windows with active approval signals.
Overlay reads position/size directly from AXWindow elements via
AXValueGetValue, eliminating the CGWindowList dependency (which
returned empty names for Electron windows anyway).
Daemon passes only the active AXWindow refs to the overlay, so
only the specific window(s) waiting for user input get flashed.
Made-with: Cursor
Renamed OverlayWindow to OverlayManager. Now discovers all on-screen
windows for the Cursor PID and creates/reuses/hides overlay windows
dynamically to match. Filters out tiny windows (<100px).
Verified: detects 3 windows across monitors.
Made-with: Cursor
