[rrbe]

Summary

Add a document-card Grid view alongside the existing result views. Cards adapt to the result container width, show eight filtered fields, and open the existing full-document preview for additional content.

Result panel
  Tree / JSON / Table / Grid
    virtualized card rows
      BSON fields, selection, preview, copy, export, edit and delete

Grid retains per-result scroll and field selection. Cmd/Ctrl+4 selects Grid; Console moves to Cmd/Ctrl+5.

Evidence

• Before: Results offered Tree, JSON and Table without a document-card layout.
  After: Grid adds responsive document cards while keeping full source documents for copy, export and editing.
• Type checking and 94 tests across seven affected renderer test files passed in the worktree.
• Prior Electron validation covered three/four-column layouts, previews, copy, selection and scroll restoration; a 2,000-document, 160-field fixture mounted 15 cards and 120 fields in a three-column viewport.

Merge Danger

Door: Two-way

Blast Radius: Renderer

Result layout and view shortcuts change. Database operations reuse the existing document actions.