v0.1.1 — interact with buried pinned windows

What's fixed

Clicking a pinned overlay when another app covers it no longer selects the covering app. The overlay now detects when the source window is buried and re-activates the source app to bring the real window forward, so you can interact with the pinned window's contents (buttons, fields) instead of the overlapping app underneath.

Also reduced refresh-loop cost: burial detection is now an O(1) frontmost-app check instead of a 60 Hz full-window enumeration, so the click-to-front response feels immediate.

Minor known bug (will catch up later)

In a multi-window app, if the source app is already frontmost but a sibling window of that app covers the pinned one, the click-through still falls to that sibling rather than re-fronting the exact pinned window. We'll address sibling-window coverage in a follow-up.

Full changelog at CHANGELOG.md.