Add graphical model view

[e-filchenko-bosh]

Description

Adds the Graphical View user interface to the Semantic Models VS Code extension.

The change includes:

• Open Graphical View command for Turtle files;
• editor-title button and editor context-menu entry;
• one Graphical View panel per Turtle document;
• secure SVG rendering with zoom, scroll restoration, and last-good-result retention;
• safe navigation from supported diagram headers and attribute rows to local Turtle source locations;
• support for multilingual preferredName and description rows;
• packaged local webview assets, including DOMPurify, font files, and the editor-title icon.

Dependencies

• Requires the matching Graphical View LSP implementation from esmf-sdk.

Additional notes:

• The view is read-only. It does not support diagram editing, remote navigation, arbitrary SVG links, or live updates while typing.