EEG Browser : HED cosmetics to fix for release (important but minor)

[christinerogers]

Module is working pretty well there are things that look broken / buggy (even if they're not technically) and should be smoothed over for the Release. (@jeffersoncasimir then for EEGNet too).
This is keeping in mind most LORIS datasets won't have HED tags on them.

• spacing looks funny between HED ... Dataset when there's no pre-existing tags on an event - see screenshot 1
• [electrohphysiology_browser] Prevent ability to add duplicate HED tags #9165
• ideally reset could be grayed out if you can't click it (like submit)

in Dataset Tag Manager

• When there are no EventValues in the whole dataset, don't display it in the Dataset Tag Manager. User can't do anything here, it looks like a bug. -- see screenshot 2.

• Change Enter Description (coming soon) to n/a -- because it's wonky for a major release to say "coming soon" (like 2026 etc...)

Otherwise:

• HED tag image is still broken on Testing from [Test Vm 26] EEG Browser major testing blockers, prob minor issues #9160 but i'm not (yet) re-opening the ticket.
  @kongtiaowang maybe [NDB_Client] Allow loading images from images.loris.ca  #9161 just needs to be pulled / sourced on the Test VM?

screenshot 1

screenshot 2

screenshot 3

[jeffersoncasimir]

All items have been addressed by #9166.

An issue was opened for the remaining actionable, as it is a significant feature. --> #9165

[christinerogers]

Adding one issue that is a just a typo so I've added the commit already to the #9166 branch :
literally the user needs to select a column name AND value to see/add HED tags - the message in italics needs a tweak
see screenshot -- they have selected column name as instructed and can't add a hed tag

[christinerogers]

confirming these are resolved in round 2 testing.

Note that on many datasets the signal viewer plot isn't loading, alerted jefferson and Shen
https://test-dev-260.loris.ca/electrophysiology_browser/sessions/2161?outputType=raw