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Three reviewer concerns land here: - Felix #2: magic numbers 0.7 and 300 belong in named constants - Sara #6: the position function had 4 branches and 2 thresholds with zero tests - Leonie FINDING-05: at 320px viewport the flip-left could push the card past the right edge — needed a viewport clamp Move the function to src/lib/utils/hoverCardPosition.ts as a pure (rect, viewport) → {top, left} mapping, with named exports CARD_WIDTH_PX, CARD_HEIGHT_PX, CARD_GAP_PX, BOTTOM_BAND_RATIO, RIGHT_FLIP_THRESHOLD_PX. Add a viewport clamp so left + CARD_WIDTH never exceeds the right edge. Ten unit tests cover default placement, flip-up (both triggers), flip-left, flip-right-edge clamp, and scroll offset. TranscriptionReadView passes the current window viewport in on each call. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>