feat: drag-and-drop into groups/parent notes + fix ⋯ button styling
Drag-and-drop: - 3-zone drop indicator for groups and parent notes (files with children): top 25% = drop above, middle 50% = drop into, bottom 25% = drop below - 2-zone for regular files/separators/spacers (unchanged) - 'Drop into' shows background highlight instead of border line - Circular reference guard: can't drop a group into itself or descendants ⋯ button: - No visible button chrome when not hovered (no border, no background) - Subtle opacity (0.6) at rest, full opacity on hover - Hover shows text color change only, no background highlight
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