Centralize hierarchical classification changes

[PaulHax]

Centralize hierarchical classification changes

PR 1 lets several user actions change classifications through existing model methods. In a
multicamera dataset, those methods can change only one camera or a temporary merged track.

This PR adds commands for one logical track. A command calculates one canonical confidence vector.
It then installs independent copies on all linked camera tracks.

Changes

• Add pure operations for reassignment, acceptance, confidence changes, and pair removal.
• Add CameraStore commands for all linked camera tracks.
• Use the first configured camera as the canonical source.
• Notify each changed camera one time.
• Route the sidebar, bottom bar, Track Details, confidence editor, and rename actions through the
  new commands.
• Preserve the commands after save and reload.

Behavior

• Reassignment replaces one hierarchy lineage and keeps unrelated alternatives.
• Accept as correct sets the selected pair to 1.0. It keeps related pairs and removes
  unrelated pairs.
• A normal confidence edit to 1.0 does not accept the pair as correct.
• Pair removal removes only the selected pair.
• PR 4 handles deletion of a logical track when its last pair is removed.

Manual tests

Test data: download and extract
classification.zip. Paths
below are relative to dive-classification-test-data/.

Single-camera classification commands

1. Create the dataset from
   dive-classification-test-data/classification/single-camera-linked-types/.
2. In separate save-and-reload cycles, reassign a leaf, accept a parent, change a confidence to
   1.0 without accepting it, and remove one pair.

Verify: Reassignment changes one lineage, acceptance removes only unrelated pairs, a normal 1.0
edit keeps unrelated pairs, and pair removal removes only the selected pair.

Multicamera classification synchronization

1. Create the dataset from
   dive-classification-test-data/classification/multicamera-linked-types/.
2. Reassign, accept, change confidence, and remove a pair; save and switch cameras after each
   action.

Verify: Both camera tracks contain equal confidence vectors after each action.

Stack

This is PR 5 of 9. Previous: add hierarchical track classification.
Next: add read-only track projections.

1. Allow devDependency imports in TypeScript spec files
2. Preserve warnings from every Desktop import file
3. Copy source metadata when creating a single-camera soft clone
4. Add hierarchical track classification
5. Current — Centralize hierarchical classification changes
6. Replace mutable merged tracks with read-only projections
7. Make track lifecycle operations classification-safe
8. Add lossless DIVE KWCOCO classification support
9. Define raw and resolved classification boundaries

This PR is stacked on hierarchical-classification-pr1.

Overall: 22 files, +1,036/-50. Commits: b1774226 through 1d2597d6.