[Milestone] Theme Editor: P2 (Enhancements & Marketplace Features) Implementation

[rezwana-karim]

Parent Epic: #235

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Objective

Implement P2 enhancements & feature-parity deliverables for the Shopify-style Theme Editor. Use all relevant documentation, docs images, sub-agents, and automation supports per project standards.

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Tasks

• Theme Marketplace: Multiple template/theme support, import/export, version badging.
• AI-powered Features: Scaffold Copilot-prompted color palette/hero text generation; prepare for section/theme generation.
• App Embed System: Plugin/extension support stub (long-term roadmap, initial panel).
• Custom CSS Editor: Monaco/CodeMirror in advanced modal for store CSS overrides.
• Reference all relevant documentation and images in /docs/shopify-theme-editor-ui-ux (and subfolders).

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Verification

• Integration tests (theme import/export)
• Visual regression based on /docs/shopify-theme-editor-ui-ux-images/*.png
• Forward-compatibility hooks for Copilot/AI agent scaffolding

/cc #235 – Use automation, sub-agents as required. Docs/images folder