feat(platform): Redirect to builder after saving agent to library and disable save button for owned agents

[kcze]

Resolves:

• Redirect to builder after adding agent to library in the marketplace #9198
• Marketplace: "Add to Library" button should be Disabled when Agent already downloaded #9200 (partially)

Changes 🏗️

• Add GET /library/agents/{store_listing_version_id} endpoint (and python function) that returns specific agent metadata to check if user owns it
• Modify POST /library/agents/{store_listing_version_id} so it returns added agent (need agent id for redirection to the builder)
• Redirect to builder when agent is added to the library
• Disabled save to library button when agent is owned by the user
• Show toast and disable button while saving or downloading
• Remove commented out AgentDetailContent.tsx and its actions.ts

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • Logged-in user owned agent displays "Already in Library"
  • Logged-in user already added agent displays "Already in Library"; not possible currently
  • Logged-in user not added agent displays "Add to Library"
  • Adding agent saves it and opens builder
  • Logged out displays "Download Agent as File"
  • Agent downloads

For configuration changes:

• .env.example is updated or already compatible with my changes
• docker-compose.yml is updated or already compatible with my changes
• I have included a list of my configuration changes in the PR description (under Changes)

Examples of configuration changes

• Changing ports
• Adding new services that need to communicate with each other
• Secrets or environment variable changes
• New or infrastructure changes such as databases

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[github-actions]

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[github-actions]

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