Function buildPopupContent

buildPopupContent(
    fields: readonly RenderField[],
    rawProperties: Record<string, unknown>,
    ctx: RenderContext,
    opts: { hasSidepanel: boolean },
): HTMLElement
Builds the popup content element for a set of resolved fields.
```
<div class="gl-poi-popup">
  [<img class="gl-poi-popup__hero">]           ← hero, outside the body
  <div class="gl-poi-popup__body">
    <div class="gl-poi-popup__badges">…</div>   ← consecutive badges grouped
    [field nodes from the shared widget dispatch]
    <a class="gl-poi-popup__link">…</a>         ← last, only when hasSidepanel
  </div>
</div>
```
Only two widgets get special treatment, and both for LAYOUT reasons rather than rendering ones: a hero image closes the current body and attaches to the root, and consecutive badges are buffered into one row instead of being interleaved with the text around them.
Parameters
- fields: readonly RenderField[]
  Render descriptors, in display order.
- rawProperties: Record<string, unknown>
  The feature's properties as they came from the source.
- ctx: RenderContext
  Render context — layer and feature identity, plus the click position.
- opts: { hasSidepanel: boolean }
  hasSidepanel tells the builder whether a "see details" affordance has anywhere to lead; without one, it is not rendered at all.
Returns HTMLElement
The popup root element, ready to mount. Text is escaped at the sinks.
- Defined in src/capabilities/feature-info/render/popup-content.ts:97