fix: portal popover content

[starc007]

What changed

• render both Gooey and Morph Popover content through a body portal
• keep portalled panels anchored to their triggers during scroll, resize, and close animations
• preserve inside interactions and outside-click dismissal across the separate DOM trees
• prevent the Gooey portal layer from covering the real trigger
• add regression tests for clipping, positioning, and dismissal behavior

Why

Both popover variants were positioned inside their trigger wrapper. Ancestors with overflow: hidden or their own stacking context could clip or cover the panel.

The shared viewport-positioning helper lets each panel escape those ancestors without changing its existing animation path.

Validation

• bun run check
• bun test — 46 tests passed