[sonofkratos92]

Summary

Fixes broken relative imports when moving or renaming files in the VS Code extension:

• Adds registerFileMoveImportUpdater (vscode/src/updateImportsOnMove.ts) hooked into vscode.workspace.onDidRenameFiles.
• Recomputes relative paths for file-sourced node instances (source.type === "file", including nested inline visual nodes) and legacy imports maps when:
  • an imported .flyde.ts / .flyde.js code node or .flyde visual subflow is moved or renamed,
  • a .flyde flow file itself is moved to a different folder, or
  • a parent directory is moved/renamed.
• Applies updates via vscode.WorkspaceEdit so open Flyde editor panels automatically receive the updated flow.
• Adds unit tests in vscode/src/test/updateImportsOnMove.spec.ts.

Fixes #112
/claim #112