chore(build): adopt Vite, pnpm, ESLint flat config; drop Vue CLI

Replaces Vue CLI 4 with Vite 7 + @tailwindcss/vite + vite-plugin-pwa,
yarn with pnpm, tslint with ESLint 9 flat config, and Jest with Vitest.
Drops Netlify deploy config and the dead FontAwesome npm token.

Bumps the entire dependency surface: Vue 3.5, Pinia 2, vue-router 4,
vue-i18n 11, Tailwind 4, DaisyUI 5, TypeScript 5.7, axios 1.x,
mapbox-gl 3.x, date-fns 4.x, uuid 11.x, pouchdb-browser 9.x.

vitest.config.ts

@@ -0,0 +1,12 @@
+import { mergeConfig, defineConfig } from 'vitest/config'
+import viteConfig from './vite.config'
+
+export default mergeConfig(
+  viteConfig,
+  defineConfig({
+    test: {
+      environment: 'happy-dom',
+      include: ['tests/**/*.spec.ts', 'src/**/*.spec.ts']
+    }
+  })
+)