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/vite.config.ts

@@ -0,0 +1,20 @@
+import vue from "@vitejs/plugin-vue";
+import { defineConfig } from "vite";
+
+// The add-on serves the built page from screen_manager/app/static behind Home Assistant ingress,
+// which lives on a sub path with a token. Everything is relative so the page works there and on
+// a bare http://127.0.0.1:8099 (SCREEN_DEV). The Python server keeps serving /api; only the static
+// files change. `npm run dev` proxies /api to a running server (the demo home or SCREEN_DEV).
+export default defineConfig({
+  base: "./",
+  plugins: [vue()],
+  build: {
+    outDir: "../screen_manager/app/static",
+    emptyOutDir: false,
+    target: "es2022",
+  },
+  server: {
+    port: 5173,
+    proxy: { "/api": { target: "http://127.0.0.1:8099", changeOrigin: false } },
+  },
+});