feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

frontend/node_modules/d3-scale/src/ordinal.js

@@ -0,0 +1,46 @@
+import {InternMap} from "d3-array";
+import {initRange} from "./init.js";
+
+export const implicit = Symbol("implicit");
+
+export default function ordinal() {
+  var index = new InternMap(),
+      domain = [],
+      range = [],
+      unknown = implicit;
+
+  function scale(d) {
+    let i = index.get(d);
+    if (i === undefined) {
+      if (unknown !== implicit) return unknown;
+      index.set(d, i = domain.push(d) - 1);
+    }
+    return range[i % range.length];
+  }
+
+  scale.domain = function(_) {
+    if (!arguments.length) return domain.slice();
+    domain = [], index = new InternMap();
+    for (const value of _) {
+      if (index.has(value)) continue;
+      index.set(value, domain.push(value) - 1);
+    }
+    return scale;
+  };
+
+  scale.range = function(_) {
+    return arguments.length ? (range = Array.from(_), scale) : range.slice();
+  };
+
+  scale.unknown = function(_) {
+    return arguments.length ? (unknown = _, scale) : unknown;
+  };
+
+  scale.copy = function() {
+    return ordinal(domain, range).unknown(unknown);
+  };
+
+  initRange.apply(scale, arguments);
+
+  return scale;
+}