feat(workspace): expand rich cell inspector modal with XML/HTML formatting, hex viewer, and shortcut support

[ZhuchkaTriplesix]

Description

Resolves #663 by expanding the showGridCellInspectorDialog modal with rich inspection and editing capabilities:

1. Formatters:

   • XML/HTML Formatting: Automatically detects XML/HTML markup and adds a Format XML button that uses XmlHtmlFormatter.
   • Hex BLOB Formatting: Automatically detects hex/binary data and provides a Format Hex button formatting pairs of bytes with clean spacing.
   • JSON Formatting & Minification: Retained with live updates.

2. Word Wrap & Statistics Bar:

   • Added Wrap / No Wrap toggle button allowing horizontal panning of long lines.
   • Added real-time text statistics bar displaying line count, character count, and UTF-8 byte size.

3. Keyboard Shortcuts:

   • Ctrl+Enter / Meta+Enter (or NumpadEnter): Apply and close dialog.
   • Alt+N: Set value to NULL.
   • Added Ctrl+I / Meta+I shortcut binding in VirtualResultGrid to open inspector dialog on currently focused cell.

4. Testing:

   • Added widget tests in test/features/workspace/grid_cell_editor_test.dart covering XML formatting, Hex formatting, wrap toggle, and shortcut execution.
   • 0 analyze errors/warnings.

Closes #663