feat(ui): redesign UI with Tailwind CSS, CodeMirror 6, and new layout

- Replace all hand-written CSS with Tailwind utility classes
- Upgrade CodeMirror 5 to CodeMirror 6 (scoped @codemirror/* packages)
- Redesign layout with responsive sidebar navigation using JSX/Mithril
- Flatten admin routes (e.g. /admin/presets -> /presets)
- Add "remember me" login option with 2-week persistent cookie
- Add delete confirmation dialogs across admin pages
- Upgrade esbuild from 0.21 to 0.27 and update browser targets
- Add Inter and Roboto Mono variable fonts with subset script

ui/components/device-link.ts

@@ -19,7 +19,7 @@ const component: ClosureComponent = (): Component => {
       });
       if (deviceId) {
         return m(
-          "a",
+          "a.text-cyan-700 hover:text-cyan-900 font-medium",
           { href: `#!/devices/${encodeURIComponent(deviceId)}` },
           children,
         );