fix: skip remote variable collections when matching by name

[phiilu]

When using variablesColors, the Figma REST API (GET /v1/files/:id/variables/local) returns both local and remote (library-subscribed) variable collections.

If a remote collection shares the same name as a local one, .first(where:) may match the remote collection instead, which in my org contains fewer variables, leading to silently missing colors in the export.

Fix: Decode the remote field from the API response on VariableCollectionValue and filter it out during collection lookup:

The remote field is documented by Figma (https://developers.figma.com/docs/rest-api/variables-types/#variablecollection-type) as:

Whether the variable collection is remote.