controlled vocabulary option for target audience

[mikesndrs]

Summary of changes
Config option to have target_audience field in events and materials use the available dictionary as options with a dropdown instead of the free string input field

Motivation and context

Easier for searching and filtering

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree to license it to the TeSS codebase under the BSD license.

[fbacall]

Should this have a validation to check the target audience is part of the dictionary?

What gets selected in the dropdown menu if you have a target audience value that is not in the dictionary?

[mikesndrs]

the dropdown is only for adding new values. pre existing values will continue to exist but new ones will only have the dictionary values as options. I don't think a validation is necessary

[Copilot]

Pull request overview

Adds a feature-flagged option to render the target_audience field for Events and Materials using a controlled-vocabulary dropdown (backed by TargetAudienceDictionary) instead of a free-text multi-input, to improve consistency for filtering/search.

Changes:

• Introduces a new feature.controlled_vocabulary_vars config list in tess.example.yml.
• Updates the Events form to conditionally use a dropdown for target_audience when the feature is enabled.
• Updates the Materials form to conditionally use a dropdown for target_audience when the feature is enabled.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
config/tess.example.yml	Documents the new controlled_vocabulary_vars feature flag.
app/views/materials/_form.html.erb	Switches target_audience input to a dictionary-backed dropdown when enabled.
app/views/events/_form.html.erb	Switches target_audience input to a dictionary-backed dropdown when enabled.

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