test(render): add unit tests for CodeHandlerImpl

[sabhi128]

Summary of Changes

This PR expands backend test coverage by adding unit tests for CodeHandlerImpl under internal/handlers/render/.

Changes:

• New File: internal/handlers/render/codes_test.go
  • Added route rendering coverage for:
    1. List route (codes_index template rendering).
    2. Detail route (parameter mapping of namespace and code_name to codes_show template).
    3. New route (checks context layout and license dictionary injection matching DefaultLicensesJSON).

All rendering calls are tested in isolation using Mockery's testifying mocks.

[Copilot]

Pull request overview

This PR increases backend test coverage for the render-layer CodeHandlerImpl by adding unit tests that verify the expected template names and key data mappings passed to the rendering layer.

Changes:

• Add unit tests for CodeHandlerImpl.List, CodeHandlerImpl.Detail, and CodeHandlerImpl.New.
• Validate route param mapping for namespace and code_name into the render data (codeName) for the detail view.
• Validate that the licenses value passed to the “new” template matches DefaultLicensesJSON.

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