More efficient flat file list format and various UX improvements (#3)

This is a major upgrade with assorted things included.

- Navigation flows improved, search appears in URL history, cleared when navigating to another folder
- More efficient file list format for faster loads
- Efficient updates, never re-send full root another time (except at connection)
- Large number of watching and filelist updates (inotify issues remain)
- File size coloring
- Fixed ZIP generation random glitches (thread race condition)
- Code refactoring, cleanup, typing fixes
- More tests

Reviewed-on: #3

frontend/vite.config.ts

@@ -0,0 +1,54 @@
+import { fileURLToPath, URL } from 'node:url'
+
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+
+// @ts-ignore
+import pluginRewriteAll from 'vite-plugin-rewrite-all'
+import svgLoader from 'vite-svg-loader'
+import Components from 'unplugin-vue-components/vite'
+
+// Development mode:
+// npm run dev           # Run frontend that proxies to dev_backend
+// cista -l :8000 --dev  # Run backend
+const dev_backend = {
+  target: "http://localhost:8000",
+  changeOrigin: false,  // Use frontend "host" to match "origin" from browser
+  ws: true,
+}
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [
+    vue(),
+    pluginRewriteAll(),
+    svgLoader(),          // import svg files
+    Components(),         // auto import components
+  ],
+  css: {
+    preprocessorOptions: {
+      less: {
+        modifyVars: {},
+        javascriptEnabled: true,
+      },
+    },
+  },
+  resolve: {
+    alias: {
+      '@': fileURLToPath(new URL('./src', import.meta.url))
+    }
+  },
+  server: {
+    proxy: {
+      "/api": dev_backend,
+      "/files": dev_backend,
+      "/login": dev_backend,
+      "/logout": dev_backend,
+      "/zip": dev_backend,
+    }
+  },
+  build: {
+    outDir: "../cista/wwwroot",
+    emptyOutDir: true,
+  }
+})