Fix TransmissionMode in "data"-menu

[Zetison]

Fix missing distinction between different TransmissionModes in the "data"-menu by including the id field in square brackets (actually, all non AbstractElement/Nothing elements are now included as indices in square brackets). Also expand TransmissionModes in the info-box.

This PR Fixes #32

[Copilot]

Pull request overview

This PR fixes the data menu labeling issue where different TransmissionModes were not properly distinguished, addressing issue #32. The fix includes all non-AbstractElement/Nothing elements as indices in square brackets in the data menu labels, and expands TransmissionModes in the info box.

Key changes:

• Modified label creation to use square brackets for indices instead of parentheses for resources
• Enhanced info box expansion to handle TransmissionModes specifically
• Added test coverage for data menu labeling functionality

Reviewed changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/utils_GUI/results_axis_utils.jl	Updated create_label to use square brackets for non-AbstractElement indices
src/utils_GUI/info_axis_utils.jl	Refactored print_nested_structure! into type-specific methods and added Expandable type alias
ext/EMGExt/EMGExt.jl	Added TransmissionMode vector printing support and simplified mode retrieval
src/utils_GUI/GUI_utils.jl	Enhanced select_data! to support selection filtering
test/test_interactivity.jl	Added test case for data menu labeling with transmission modes
test/utils.jl	Added fetch_element helper function for tests
test/EMI_geography_2.jl	Added H2_Transport_50MW_OT transmission mode to test data
src/utils_gen/structures_utils.jl	Updated get_resource_colors to use unique(vcat(inputs(l), outputs(l)))
NEWS.md	Documented the bugfix and enhancements

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[espenfb]

This fixes the issue with distincion of the parameters for different transmission modes nicely. The implementation looks good and I have no comments.

The print in the info-box could be a bit more styled, it is a bit long and some details could probably be skipped. But this should be done in a seperate Issue (it's the same for other elements such as nodes etc.).