Feat/workflows

[pedrofrxncx]

What is this contribution about?

Describe your changes and why they're needed.

Screenshots/Demonstration

Add screenshots or a Loom video if your changes affect the UI.

Review Checklist

• PR title is clear and descriptive
• Changes are tested and working
• Documentation is updated (if needed)
• No breaking changes

---

Summary by cubic

Introduces a visual workflow builder with real-time streaming execution and an authenticated MCP tool call utility, so you can build, run, and debug workflows inside Mesh. Adds an event bus with publish support for cross-connection events and switches local dev to port 4000.

• New Features

  • Workflow UI: steps canvas, view switcher, and Monaco editor with output type inference.
  • Streaming execution: live step results with polling, executions history tab with keyboard navigation, and start/stop runs.
  • Tool steps: connection/tool selection, RJSF input forms with @-mentions, output schema selection, and optional TypeScript transformCode to shape outputs.
  • Auth tool: CONNECTION_CALL_TOOL routes tool calls through the MCP proxy with access checks.
  • Workflow binding: expanded schemas and new WORKFLOW and WORKFLOW_EXECUTION bindings; collection hooks for workflow items.
  • Event bus: publish support for mesh events (e.g., connection.created).
  • Safer SQL in DATABASES_RUN_SQL via value escaping and placeholder replacement.
  • UI updates: resizable panels and execution status bar, improved ScrollArea, optional select icon, and “marching ants” stroke animation.

• Migration

  • Local dev now runs at http://localhost:4000; update BASE_URL and any client configs.
  • DB: add next_retry_at to event_deliveries to support exponential backoff.
  • Install new deps: @monaco-editor/react, zustand, @tiptap/react, @tiptap/starter-kit, @tiptap/extension-mention, @tiptap/pm, @tiptap/suggestion, lucide-react, prettier.

^{Written for commit a088c89. Summary will update automatically on new commits.}