Add visual domain mapping for single-feature Domains tab

[olsonanl]

Summary

• Implements an interactive D3-based visualization that displays protein domains as colored rectangles positioned along a protein sequence bar
• The visualization appears above the grid when viewing domains for a single feature/protein (not shown for multi-protein domain lists)
• Includes track-based layout for overlapping domains, colorblind-accessible color coding by source database, tooltips, and external database links

Fixes https://github.com/BV-BRC/issues/issues/1502

Features

• Horizontal protein backbone with domain rectangles positioned by start/end coordinates
• Track-based layout algorithm to handle overlapping domains
• Color-coded domains by source database (CDD, InterPro, Pfam, TIGRFAM, SMART, etc.)
• Tooltips showing domain details (source, position, e-value)
• Click to open external database links (CDD, InterPro, Pfam, etc.)
• Bidirectional selection/hover sync between visualization and grid
• Collapsible panel with scrollable content

New Files

• D3DomainViewer.js - Core D3 visualization widget
• DomainColorScheme.js - Color palette and external URL mappings
• DomainVisualizationPanel.js - Collapsible container panel
• domain-viewer.css - Styling for visualization components

Test plan

• Navigate to a Feature page with domains (e.g., /view/Feature/PATRIC.xxx#view_tab=proteinFeatures)
• Verify the Domain Map visualization appears above the grid
• Check domain rectangles are positioned correctly on the protein backbone
• Verify color coding matches source databases in legend
• Hover over domains to see tooltips with details
• Click a domain to open external database link
• Select rows in grid and verify visualization highlights corresponding domains
• Collapse/expand the panel using the toggle button
• Scroll the panel when many domains are present
• Navigate to a multi-protein domain list and verify visualization does NOT appear

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