Inspector app improvements

[bdon]

• [x] SVG tile previews should be zoomable
• [x] Should be able to drill down into leaf directories
• [x] should be able to preview vector tiles in leaflet
• [x] SVG should be feature-level inspectable
• [x] map preview should be feature-level inspectable
• [x] see directory Len and header-level metadata
• [ ] inspect SVG with mismatched extents
• [ ] correctly read tile and map hash states
• [x] split out "individual tile inspector" to separate page
• [ ] view raw zxy and TIleJSON endpoints

[bdon]

See if we can reuse https://github.com/acalcutt/maplibre-gl-inspect

[bdon]

• Display labels from TileJSON

[bdon]

Should re-use https://github.com/maplibre/maplibre-gl-inspect