Implement dendrogram double-click zoom focus animation

[cornhundred]

Summary

• add double-click detection for dendrogram polygons to differentiate single versus double clicks
• compute cluster-centric zoom and pan targets and animate the deck.gl view state to focus the matrix on the selected dendrogram
• synchronize zoom bookkeeping so subsequent interactions continue from the focused state

Testing

• npx eslint js/deck-gl/matrix/dendro_layers.js

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Codex Task

[Copilot]

Pull Request Overview

This PR adds double-click zoom and focus animation functionality to the dendrogram visualization. When users double-click a dendrogram cluster, the view animates to focus on that cluster with appropriate zoom level. Single clicks continue to highlight clusters without zooming.

Key changes:

• Added double-click detection logic with configurable delay to differentiate single vs double clicks
• Implemented animated zoom and pan transitions that center the view on selected dendrogram clusters
• Added state synchronization to ensure subsequent interactions work correctly from the focused state

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