feat(editor): add pre-built inspector section components

[joaopcm]

Summary

• Add 7 composable section components: Inspector.Background, Inspector.Padding, Inspector.Border, Inspector.Size, Inspector.Typography, Inspector.Attributes, Inspector.Link
• Wire default rendering into Inspector.Node (per-node-type layout) and Inspector.Text (Typography + Link)
• All sections accept initialCollapsed prop and wrap content in collapsible <Section>

Usage

// Compose sections declaratively
<Inspector.Node>
  {(ctx) => (
    <>
      <Inspector.Background {...ctx} />
      <Inspector.Padding {...ctx} />
      <Inspector.Border {...ctx} initialCollapsed />
    </>
  )}
</Inspector.Node>

// Or use defaults — renders sensible sections per node type
<Inspector.Node />
<Inspector.Text />

Context

Part of the inspector sidebar redesign (PRODUCT-1739). Stacked on top of #3187 (Inspector.Node + Inspector.Text).

Test plan

• pnpm lint:fix passes
• All 119 existing inspector tests still pass
• All sections exported on Inspector compound component

[vercel]

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Project	Deployment	Actions	Updated (UTC)
react-email	Ready	Preview, Comment	Apr 6, 2026 7:43pm
react-email-demo	Ready	Preview, Comment	Apr 6, 2026 7:43pm
react-email-examples	Ready	Preview, Comment	Apr 6, 2026 7:43pm

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Latest commit: 3a5b96f

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commit: 3a5b96f