feat(de-components): add per-instance property override actions

[shaynelarocque]

Refs #96.

Heads up: this PR was drafted by Claude Code, aimed at the pain point in #96 (no MCP surface for setting per-instance component props — element_tool.set_text errors on instances, and Data API update_static_content rejects the primary locale). Totally fine if the team prefers to implement this themselves; wanted to put a concrete shape on the table.

What

Adds three actions to the existing de_component_tool, mirroring the Designer SDK's per-instance prop APIs on ComponentElement:

Action	Wraps
set_component_instance_props	setProps(entries)
get_component_instance_props	getProps() / getResolvedProps() (via resolved: true)
reset_component_instance_props	resetAllProps()

Schema

set_component_instance_props: {
  id: { component: string; element: string };
  overrides: Array<{ prop_id: string; value: unknown | null }>; // null = reset this prop
}

get_component_instance_props: {
  id: { component: string; element: string };
  resolved?: boolean; // default false -> returns entries with hasOverride
}

reset_component_instance_props: {
  id: { component: string; element: string };
}

Example

{
  "name": "de_component_tool",
  "arguments": {
    "siteId": "…",
    "actions": [{
      "set_component_instance_props": {
        "id": { "component": "c_123", "element": "e_456" },
        "overrides": [{ "prop_id": "Text", "value": "Hello from MCP" }]
      }
    }]
  }
}

⚠️ Companion change required

The MCP server is a generic RPC forwarder (src/modules/designerAppBridge.ts). These actions are emitted verbatim over the socket to the Webflow MCP Bridge App, which needs a matching handler mapping each action to the SDK call. This PR ships the MCP-side schema only — a companion Bridge-App change is required for #96 to actually close.

I intentionally used Refs #96 rather than Closes #96 for that reason.

Testing

• npm run build clean (before and after).
• npx tsc --noEmit clean.
• Zod schema smoke cases covered: static string / number / boolean overrides, binding-object value, null reset-per-prop, empty-overrides rejected, resolved: true, reset-only action, empty-action rejected.
• No live Designer smoke test (couldn't attach to a session from where I'm working).
• Repo has no test framework; did not introduce one.

Files

• src/tools/deComponents.ts — three new action keys on de_component_tool, refine guard updated.
• src/tools/rules.ts — three guidance lines added to webflow_guide_tool.

[tterb]

These changes look good to me, but it might be worth getting a quick check from @memo-pineda since he has a lot more MCP context 👍

[tterb]

I think z.any() allows undefined, functions, ect... Is that the behavior that we want or would something like this be better here?

z.union([
  z.string(), z.number(), z.boolean(), z.null(),
  z.record(z.unknown()),
])