Add contributing file, rename some files

src/app/util/toast.ts

@@ -0,0 +1,41 @@
+import type {Component} from "svelte"
+import {writable} from "svelte/store"
+import {randomId} from "@welshman/lib"
+import {copyToClipboard} from "@lib/html"
+
+export type ToastParams = {
+  message?: string
+  timeout?: number
+  theme?: "error"
+  children?: {
+    component: Component<any>
+    props: Record<string, any>
+  }
+  action?: {
+    message: string
+    onclick: () => void
+  }
+}
+
+export type Toast = ToastParams & {
+  id: string
+}
+
+export const toast = writable<Toast | null>(null)
+
+export const pushToast = (params: ToastParams) => {
+  const id = randomId()
+
+  toast.set({id, ...params})
+
+  setTimeout(() => popToast(id), params.timeout || 5000)
+
+  return id
+}
+
+export const popToast = (id: string) => toast.update($t => ($t?.id === id ? null : $t))
+
+export const clip = (value: string) => {
+  copyToClipboard(value)
+  pushToast({message: "Copied to clipboard!"})
+}