v1.4.0 — Page properties

Page properties — front-matter as an editable table

Requested in #1. Paperus now shows a Notion/Obsidian-style Properties panel
directly under the page title: your document's YAML front-matter rendered as an
editable key→value table.

• Add / rename / edit / remove simple key: value metadata without ever
  touching the raw --- block (it stays hidden by the live-preview decorations).
• Built for agent skills, system prompts and personality profiles — manage
  name, description, tools, model, etc. as structured fields.
• Reserved page-meta keys (icon, cover, width, locked) keep their own
  dedicated controls and are preserved on every write.
• Locked pages render the table read-only.

Download / update

• macOS universal DMG is attached below (signed + notarized + stapled).
• Existing installs auto-update to 1.4.0 on next launch.
• Build from source: pnpm install && pnpm run dev.