Update Flyde imports after file rename

[Entr0zy]

Fixes #112.

Summary

• update Flyde file references when VS Code renames or moves files
• rewrite referenced paths relative to each .flyde file
• support direct file moves, directory moves, and nested inline flow references
• skip malformed flows instead of blocking the rename hook

Verification

node ..\node_modules\.pnpm\typescript@5.8.3\node_modules\typescript\bin\tsc -p .
node ..\node_modules\.pnpm\mocha@10.8.2\node_modules\mocha\bin\mocha out\test\updateFlowImportsAfterRename.test.js --ui tdd

Focused test result:

updateFlowImportsAfterRename
  passed updates file source paths relative to the flow file
  passed updates nested inline flow references
  passed updates references when a containing directory is moved

3 passing