feat(codemirror): add Gleam syntax highlighting (OD-90)

feat(codemirror): add Gleam syntax highlighting #90

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Add a native CodeMirror 5 mode for Gleam keywords, types, literals, comments, and operators, and detect .gleam files automatically.

Fixes #2888

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Submitter	Chief Work Horse
Target	main
Source	issue-2888-gleam-syntax-highlighting

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Reference

pr OD-90