Duplicate `UpdateProps` emitted on receiver components that already implement it

For a method (receiver) template, the generator unconditionally emits an UpdateProps method after generating Render, even when the receiver type already declares one. Go then rejects the type with a duplicate-method error.

Environment

• go-tui: v0.17.0

Minimal reproduction

package repro

import tui "github.com/grindlemire/go-tui"

type lifecycleRow struct {
    value string
}

func (r *lifecycleRow) UpdateProps(fresh tui.Component) {}

templ (r *lifecycleRow) Render() {
    <span>{r.value}</span>
}

Actual

Generation emits a second UpdateProps method, and Go rejects it:

method lifecycleRow.UpdateProps already declared

The generator calls generateUpdateProps unconditionally for method templates after generating Render, without honoring a user-owned method.

Expected

Receiver component types own their handwritten lifecycle methods; generated function-view types own generated lifecycle methods. The generator must not add a lifecycle method to a receiver that already implements the relevant runtime interface.