Handle approval flow in theme publish command

[mikel]

Problem

The CLI needs to handle the new approval flow from the Rails API (core-gem PR #7103).

Previously, the API auto-published all changes. Now it requires approval:

• Draft/review status → submitted for approval
• Approved status → marked as published

Solution

Update CLI to parse and display the API response appropriately.

Changes:

API Client (internal/api/content_changes.go)

• Add PublishResponse type with message, status, note fields
• Update Publish() to return *PublishResponse instead of just error

Theme Publish Command (internal/commands/theme_publish.go)

• Parse publish response to determine outcome
• If status="review": Show "submitted for approval" message
• If status="published": Show success message
• Keep content change in sync state if pending approval
• Clear sync state after successful publish

Response Types (internal/commands/responses.go)

• Add Message field to ThemePublishResponse

User Experience:

Before (always auto-published):

✓ Published theme 'my-theme' to live site

After (requires approval):

ℹ Content change submitted for approval
  Changes will be applied after approval in Salesforce

  Content change ID: abc-123-def
  The theme will be published after approval in Salesforce

JSON Output:

{
  "success": true,
  "data": {
    "theme_name": "my-theme",
    "content_change_id": "abc-123-def",
    "status": "review",
    "message": "Content change submitted for approval"
  }
}

Related

• Depends on: core-gem PR #7103 (Enforce approval flow)
• Part of: THEME_AND_CHANGE_SETS.md Phase 1

Testing

# Build CLI
make build

# Test against local server (after deploying gem PR #7103)
./bin/sc theme push my-theme
./bin/sc theme publish my-theme  # Should show "submitted for approval"

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