dea-web-viewer: Full-text search across all catalog entries

[emmanuel-a-otchere]

WBS: WP-V-005 | Web Viewer & Packaging

Phase: Code | Layer: L2 — Tooling | Priority: Medium

Objective

Add full-text search to the web viewer.

Deliverables

• Search bar in top navigation
• Searches: name, description, tags, relationships
• Results: ranked by relevance, grouped by entity type
• Keyboard shortcut: Cmd/Ctrl+K to focus search
• Powered by FlexSearch (client-side, no backend required)