Render hierarchical types as a tree

Bryon called out three follow-ups during review of the original hierarchy PR:
render the Type List as a tree, let a parent toggle its children, and roll child counts into
parents. For datasets without a type hierarchy, the Type List retains its existing flat behavior.

Changes

• Indent descendants and add branch disclosure controls.
• Give parent checkboxes checked, unchecked, and indeterminate states; toggling a parent applies to
  its complete subtree.
• Keep ancestor paths visible during search and sort siblings within each branch.
• Compact a shared unused leading lineage behind Expand Parents and Compact Parents.
• Roll descendant totals and current-frame counts into their parents.
• Make parent maximum-count navigation include descendants and use the same selected-camera and
  suppression rules as the displayed counts.
• Keep structural parents visible with Show Empty off, without showing disclosure controls for
  children that are filtered out.

Manual tests

Test data: upload and extract
hierarchical-type-list.zip
The ZIP opens to hierarchical-type-list/ with self-contained synthetic/ and sefsc/ datasets.

Type List controls and counts

1. Create a 1 FPS image-sequence dataset from synthetic/images/, then import
   synthetic/annotations.json and synthetic/config.json.
2. Exercise branch collapse, parent checkboxes, search, Show Empty, all three sort modes, and
   Expand Parents / Compact Parents.
3. Compare counts at frames 0, 2, and 4, then use the fish maximum-count button.
4. Set the suppression region type to fish; uncheck and recheck juvenile-red-snapper and
   red-snapper.

Verify: The tree and tri-state checkboxes follow the hierarchy, search keeps the ancestor path, and
the compact breadcrumb is eukaryota › animalia › chordata. Parent counts include descendants;
fish totals four tracks and seeks to frame 2. Suppressed detections do not reappear in parent
counts or peak navigation.

Real SEFSC-SEAMAP hierarchy

1. Create a 5 FPS video dataset from the MP4 in sefsc/, then import its VIAME CSV and
   configuration from the same directory.
2. Search, collapse branches, and sort the Type List.

Verify: The 24 real tracks render in the correct hierarchy from eukaryota through the eight
observed species.

This is a follow-up to
Define raw and resolved classification boundaries.