Feature Request(dashboards): first-class section / spacer tiles for grouping

Feature request

Is your feature request related to a problem?

Customer feedback: "Any opportunity to add spacers/sections to dashboards to split sections out?"

Today, PostHog dashboards expose three tile types via the Add menu: Insight, Text card, and Button. There is no first-class way to group tiles into labeled sections, insert a visual divider between groups, or reserve vertical whitespace as a deliberate spacer.

Describe the solution you'd like

Add a fourth tile type to the Add menu in frontend/src/scenes/dashboard/DashboardHeaderActions.tsx, for example Section, that provides:

• A clear label / title input
• Optional short description below the title
• Full-width-by-default placement that starts a new row in the grid
• A built-in visual treatment so it does not look like a regular tile (transparent background, larger heading, optional underline / divider)
• Sensible defaults so a user can drop one in without resizing

Optionally, also expose a lighter Spacer / Divider that is just a horizontal rule with configurable height, for visual separation without a label.

Describe alternatives you've considered

The current workaround is functional but not discoverable:

1. Add a Text card.
2. Use a markdown heading (#, ##, or ###).
3. Toggle Transparent background.
4. Manually resize to full width and drag to the right row.

Reported in: https://posthoghelp.zendesk.com/agent/tickets/57876 (moved to PostHog: https://us.posthog.com/project/2/support/tickets/58898)

Start in frontend/src/scenes/dashboard/DashboardHeaderActions.tsx and inspect how the existing Insight, Text card, and Button tile types are added. Define the scope for Section versus the optional Spacer/Divider, then verify that the chosen tile can be added with sensible defaults, labeled or separated visually, and placed full-width on a new dashboard row.