DYN-10266: Disallow DYF Files as Templates in File Open Template Dialog

[ivaylo-matov]

Purpose

This PR addresses DYN-10266. It updates the File -> Open -> Template flow so it behaves as a template-only entry point.

Changes:

• restricted the template open dialog file filter to .dyn only
• added a template-specific dialog title resource and wired the template path to use it - "New graph from template"

Declarations

Check these if you believe they are true

• Is documented according to the standards
• The level of testing this PR includes is appropriate
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.

Release Notes

This PR updates the File -> Open -> Template flow so it behaves as a template-only entry point.

Reviewers

@zeusongit
@DynamoDS/eidos

FYIs

@dnenov
@johnpierson

[github-actions]

See the ticket for this pull request: https://jira.autodesk.com/browse/DYN-10266

[Copilot]

Pull request overview

Updates Dynamo’s File → Open → Template flow to behave as a template-only entry point by tightening the open-dialog behavior for templates and introducing a dedicated, localized dialog title.

Changes:

• Restricts the template open dialog filter to .dyn files.
• Adds and wires a new localized dialog title resource (“New Graph from Template...”).
• Updates PublicAPI tracking for the new resource accessor.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/DynamoCoreWpf/ViewModels/Core/DynamoViewModel.cs	Adjusts file dialog filter and title based on whether the dialog is invoked for templates.
src/DynamoCoreWpf/PublicAPI.Unshipped.txt	Records the newly exposed resource accessor in the public API unshipped list.
src/DynamoCoreWpf/Properties/Resources.resx	Adds the neutral-culture string for the new template dialog title.
src/DynamoCoreWpf/Properties/Resources.en-US.resx	Adds the en-US localized string for the new template dialog title.
src/DynamoCoreWpf/Properties/Resources.Designer.cs	Adds the strongly-typed resource property for the new string.

Files not reviewed (1)

• src/DynamoCoreWpf/Properties/Resources.Designer.cs: Language not supported

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[johnpierson]

Hey @ivaylo-matov - solid work here. The changes look clean and the separation between template and non-template flows is well done. Last thing is to see what is failing on that smoke test