Rebuild the editor as a Vue app: sidebar, pages side by side, tile settings in a drawer (0.2.74)

The page is now web/ (Vue 3 + Vite + TypeScript), built into screen_manager/app/static
with hashed file names; server.py serves index.html as built and /assets/. The Python
API, the data and the firmware are unchanged. Your screens sit in a sidebar, the pages
of a screen stand next to each other at the screen's own shape, the library sits on the
right, and a tile's settings slide in as a drawer while the mockup stays in view. New
screen, Firmware & USB, Alerts, Override YAML and Settings are pages of their own.
Fonts moved to web/src/assets; the tests read the source through tests/editor_sources.py.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

web/src/components/Toast.vue

@@ -0,0 +1,10 @@
+<script setup lang="ts">
+import { dismissToast, state } from "../store";
+</script>
+
+<template>
+  <div v-if="state.toast" id="toast" class="toast" role="status">
+    <span>{{ state.toast.message }}</span>
+    <button v-if="state.toast.action" type="button" @click="state.toast.action.run(); dismissToast()">{{ state.toast.action.label }}</button>
+  </div>
+</template>