[WIP] Implement promotion of images from WorkshopIdea to Workshop

[Copilot]

Image Promotion for WorkshopIdea → Workshop and StoryIdea → Story

Progress:

• Explore codebase to understand current implementation
• Fix WorkshopFromIdeaService to properly duplicate PrimaryAsset and GalleryAssets with correct types
• Add "Promote to Workshop" button to WorkshopIdea edit page (similar to StoryIdea)
• Create StoryFromIdeaService to handle asset duplication for Story promotion
• Update StoriesController to use the new service
• Add tests for asset promotion in both services
• Manual testing to verify images are promoted correctly (requires docker/bundler setup)

Changes Made:

1. WorkshopFromIdeaService: Fixed duplicate_assets method to preserve asset types (PrimaryAsset vs GalleryAsset) instead of creating generic Assets
2. StoryFromIdeaService: Created new service to handle Story promotion from StoryIdea with proper asset duplication
3. StoriesController: Updated new action to use StoryFromIdeaService when story_idea_id param is present
4. WorkshopIdea edit view: Added "Promote to Workshop" button (matches pattern from StoryIdea)
5. Tests: Added comprehensive test coverage for both services with asset duplication scenarios
6. Test fixture: Created minimal JPEG test image for test suite

Original prompt

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This section details on the original issue you should resolve

<issue_title>Make sure images get promoted for WorkshopIdea -> Workshop and StoryIdea -> Story</issue_title>
<issue_description>Make sure images get promoted for WorkshopIdea -> Workshop and StoryIdea -> Story

--
OLD NOTES:
WorkshopIdeas are submitted by Users, and may or may not become Workshops
We want admins to be able to "promote" a WorkshopIdea to a Workshop, via url params

Follow the pattern established by StoryIdea form -> Story form, so the same feature is available for WorkshopIdeas
(the pattern is essentially adding url params to the "Promote" button, which is a new_workshop_path button and the Workshop form needs to default to params sent or f.object values)

</issue_description>

<agent_instructions>research the Promote option from WorkshopIdea->Workshop and StoryIdea->Story, and make sure that any attachments (primary_asset, gallery_assets) submitted with the "idea" get attached to the new record when in the "new" form for the new item (Workshop or Story).</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Make sure images get promoted for WorkshopIdea -> Workshop and StoryIdea -> Story #518

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