[Nitro CLI] Handle duplicated names

[tobias-tengler]

No description provided.

[Copilot]

Pull request overview

This PR updates the Nitro CLI client to recognize duplicate-name creation failures for clients, OpenAPI collections, and MCP feature collections, so the CLI can return a friendlier error when the backend rejects a duplicate resource name.

Changes:

• Added a new DuplicateNameError GraphQL fragment and included it in the three relevant create mutations.
• Updated CLI command handlers to map duplicate-name mutation errors to a dedicated user-facing message.
• Extended command tests to cover the new duplicate-name error path for client, OpenAPI, and MCP creation.

Reviewed changes

Copilot reviewed 11 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Nitro/Common/src/ChilliCream.Nitro.Client/persisted/operations.json	Regenerates persisted operation payloads/hashes to include the new duplicate-name fragment usage.
src/Nitro/Common/src/ChilliCream.Nitro.Client/OpenApi/Operations/CreateOpenApiCollectionCommand.graphql	Adds DuplicateNameError to OpenAPI collection creation errors.
src/Nitro/Common/src/ChilliCream.Nitro.Client/Mcp/Operations/CreateMcpFeatureCollectionCommand.graphql	Adds DuplicateNameError to MCP feature collection creation errors.
src/Nitro/Common/src/ChilliCream.Nitro.Client/fragments.graphql	Defines the shared DuplicateNameError fragment.
src/Nitro/Common/src/ChilliCream.Nitro.Client/Clients/Operations/CreateClientCommand.graphql	Adds DuplicateNameError to client creation errors.
src/Nitro/CommandLine/test/CommandLine.Tests/Commands/OpenApi/CreateOpenApiCollectionCommandTests.cs	Adds coverage for duplicate-name handling in OpenAPI create command tests.
src/Nitro/CommandLine/test/CommandLine.Tests/Commands/Mcp/CreateMcpFeatureCollectionCommandTests.cs	Adds coverage for duplicate-name handling in MCP create command tests.
src/Nitro/CommandLine/test/CommandLine.Tests/Commands/Clients/CreateClientCommandTests.cs	Adds coverage for duplicate-name handling in client create command tests.
src/Nitro/CommandLine/src/CommandLine/Messages.cs	Introduces a shared duplicate-name message helper.
src/Nitro/CommandLine/src/CommandLine/Commands/OpenApi/CreateOpenApiCollectionCommand.cs	Maps OpenAPI duplicate-name errors to the new shared message.
src/Nitro/CommandLine/src/CommandLine/Commands/Mcp/CreateMcpFeatureCollectionCommand.cs	Maps MCP duplicate-name errors to the new shared message.
src/Nitro/CommandLine/src/CommandLine/Commands/Clients/CreateClientCommand.cs	Maps client duplicate-name errors to the new shared message.

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