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.ts

@@ -127,7 +127,7 @@ export function contextifyComponent(component: ComponentTypes): ComponentTypes {
             return res;
           } catch (err) {
             return m(
-              "p.error",
+              "p.text-sm font-bold text-red-500 cursor-pointer",
               {
                 title: "Click to print stack trace to console",
                 onclick: () => console.error(err),