[openstreetmap/openstreetmap-website] Restrict building editing until zoom level 19 (PR #6574)

[Arif Faisal]

## Summary
Adds a zoom-level restriction for building editing in the iD editor. When the user is zoomed out (typically <19), building features are auto-hidden via the existing rendererFeatures culling system. Roads remain visible and editable at all zoom levels.

## What’s Changed
- Uses the iD renderer’s feature rules to restrict building visibility when feature density is high.
- Behavior:
  - zoom < 19 → buildings hidden & non-editable
  - zoom ≥ 19 → buildings visible & editable

## Why
- Improves editing precision for buildings.
- Reduces accidental building edits when zoomed out.
- Aligns editable behavior with intended UX for detailed geometry.

## Testing
- Zoomed out below 19: buildings disappear, roads still editable.
- Zoomed in to ≥19: buildings appear and are editable again.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6574

-- Commit Summary --

  * formatted code
  * formatted code
  * Restrict building editing until zoom 19

-- File Changes --

    M vendor/assets/iD/iD.js (131184)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6574.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6574.diff

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