fix: multi-line import expression syntax highlighting

[ccitro]

Changes Made

• Updated the begin regular expression in import-expression by removing the end-of-line anchor ($). This allows the expression to match the opening { even if it's not on the same line as the @ symbol.
• Updated the end regular expression in import-expression by removing the start-of-line anchor (^), whitespace matcher (\\s*), and the end-of-line anchor ($). This modification allows the expression to match the closing } regardless of its position on the line.

Testing

The fix has been tested with various single-line and multi-line import expressions to ensure syntax highlighting doesn't break later in the file. I might not be familiar with all use cases, so I'd recommend checking any expected patterns.

[a-h]

Thanks for this, and sorry for the delay in reviewing and merging.

[a-h]

I've tested it, looks good!