add tldraw5 with import/export .tldraw offline support

[chee]

• also upgrades and unlists tldraw4
• has a one-way migrator for tldraw4->tldraw5 (in the tldraw5 package)

the tldraw offline support is interesting. because .tldraw has javascript files in it, and the javascript files can add shapes and features, i've had to provide a different initialization process. it runs config.js first if it's there, to set up shapes etc.

this is also a place we could load patchwork tldraw plugins, if we wanted to have that as a concept. defaulting to some that we think are core to the system (being able to embed a patchwork tool?), and allowing more to be added to a given tldrawing (similar to how the /plugins works in Chat now)

so, i think it might be cool to do that as part of this PR. removing the custom code we have for patchwork-view and patchwork dnd and add those as plugins this package also exports and loads by default.

how would we want to implement that? a cute thing might be to initialize new tldraw5s with a config.js that does:

import {getRegistry} from "@inkandswitch/patchwork-plugins"

let plugins = getRegistry("tldraw5:config")
let patchworkView = plugins.get("shape:patchwork-view")

export default function (ctx) {
  return patchworkView(ctx)
}

and a similar main.js

import {getRegistry} from "@inkandswitch/patchwork-plugins"

let plugins = getRegistry("tldraw5:main")
let dnd = plugins.get("dnd")

export default function (ctx) {
  dnd(ctx)
}

though then they wouldn't work when exported to a .tldraw file (without stripping this away*) so maybe better we inject a little plugin system more like Chat and pop it in the menu

*or actually making patchwork-view,plugins,etc work in tldraw offline, which would be sick

[patchcrow]

✅ Patchwork glance ready

https://patchwork-preview-35--patchwork-base.netlify.app

Patchwork from inkandswitch/patchwork.inkandswitch.com, packages from this PR at 8cf7213.

build-info.json