Style selection: UI/UX polish

[taipeicoder]

Description

These are the UI/UX polish tasks that either need more clarification or time to work on:

• How to handle theme descriptions?
  For now, we just display the first sentence of the description. (D86697-code)
• How to handle preview without style variations? Sidebar would look very empty.
  Style selection: Show old preview for themes that don't have style variations #67629
• Update the mobile breakpoint to 1024px.
  Style selection: Updated full-screen preview's mobile layout breakpoint to 1024px #67778
• Clicking a style variation from the style indicator should open the preview with the variation selected.
  Style selection: Style preview UI/UX polish #67436
• Style preview font-rendering not loading the correct font.
  We are likely to not address this in the MVP due to technical complications. See: pbxlJb-2ow-p2

Acceptance Criteria

Discuss with stakeholders to align on how to handle the issues mentioned above.

[SaxonF]

How to handle preview without style variations? Sidebar would look very empty.

@taipeicoder let's move forward with just showing the old preview on themes without variations for now.

[taipeicoder]

Closing as it's deployed.