Live preview for event page editing

[mattstratton]

Context

PRD §1.3 — Organizers need to preview their changes before they go live, or see how the public page looks while editing.

Requirements

• "View public page" link from the editing UI that opens the public event page
• Optionally: live preview pane alongside the editor showing rendered output
• Preview should reflect unsaved changes (for the live pane approach)
• Or at minimum: saved changes immediately visible on public page with a direct link

Current State

• No preview functionality exists
• EventEdit.vue has no link to the public event page
• Public event pages render from database, so saved changes are immediately live

Implementation Notes

• Simplest: add a "View Public Page" button/link in the editing UI header
• More advanced: split-pane editor with live preview using markdown rendering
• Consider draft/publish workflow if "immediately live" is a concern (probably Phase 2)

Acceptance Criteria

• Organizers can easily navigate from edit view to public view
• Preview accurately reflects current saved state
• Link opens in new tab (don't lose editing context)

References

• PRD §1.3 — Preview