Root-cause of the theme-picker friction: the primitive's focus model is fine
(keyboard nav reaches a ClideMenu through the overlay), but the shared harness()
uses Overlay(canSizeOverlay) + a zero-size MediaQuery, which mispositions an
anchored follower off-screen and defeats autoFlip.
- autoFlip now reads the real view size (View.physicalSize) instead of
MediaQuery.size, so it flips correctly even when MediaQuery is overridden.
- Drop the inner Align in the follower — it pegged the panel to a corner of the
full-screen follower box and broke hit-testing for non-top-left anchors, so
end-aligned menu items weren't mouse-tappable.
- Add anchoredHarness() — a properly-sized Overlay tree for testing popover
content (the remaining migrations will use it).
Tests: keyboard nav through the overlay, an end-aligned item is mouse-tappable,
and autoFlip flips below->above near the bottom edge.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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