Add side panels, task selection, graph animation, and project docs

- Foldable left panel (user profile) and right panel (task details)
- Clicking a task in the list or graph node selects it and shows details
- Both views (task list + graph) always mounted via absolute inset-0 for
  correct canvas dimensions; tabs toggle visibility with opacity
- Graph node selection animation: other nodes repel outward (charge -600),
  then selected node smoothly slides to center (500ms cubic ease-out),
  then charge restores to -120 and graph stabilizes
- Graph re-fits on tab switch and panel resize via ResizeObserver
- Fix UUID string IDs throughout (backend returns UUIDs, not integers)
- Add TaskDetailPanel, UserPanel components
- Add CLAUDE.md project documentation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/babel-preset-current-node-syntax/src/index.js

@@ -0,0 +1,86 @@
+function works(test) {
+  try {
+    // Wrap the test in a function to only test the syntax, without executing it
+    (0, eval)(`(() => { ${test} })`);
+    return true;
+  } catch (_error) {
+    return false;
+  }
+}
+
+function getPluginsList(tests) {
+  const plugins = [];
+  for (const [name, cases] of Object.entries(tests)) {
+    if (cases.some(works)) {
+      plugins.push(require.resolve(`@babel/plugin-syntax-${name}`));
+    }
+  }
+  return plugins;
+}
+
+const babel7OnlyPlugins = getPluginsList({
+  // ECMAScript 2018
+  "object-rest-spread": ["({ ...{} })", "({ ...x } = {})"], // Babel 7.2.0
+  "async-generators": ["async function* f() {}"], //  Babel 7.2.0
+
+  // ECMAScript 2019
+  "optional-catch-binding": ["try {} catch {}"], // Babel 7.2.0
+  "json-strings": ["'\\u2028'"], // Babel 7.2.0
+
+  // ECMAScript 2020
+  bigint: ["1n"], // Babel 7.8.0
+  "optional-chaining": ["a?.b"], // Babel 7.9.0
+  "nullish-coalescing-operator": ["a ?? b"], // Babel 7.9.0
+  // import.meta is handled manually
+
+  // ECMAScript 2021
+  "numeric-separator": ["1_2"],
+  "logical-assignment-operators": ["a ||= b", "a &&= b", "a ??= c"],
+
+  // ECMAScript 2022
+  "class-properties": [
+    "(class { x = 1 })",
+    "(class { #x = 1 })",
+    "(class { #x() {} })",
+  ],
+  "private-property-in-object": ["(class { #x; m() { #x in y } })"],
+  "class-static-block": ["(class { static {} })"],
+  // top-level await is handled manually
+
+  // Stage 3
+  // import attributes is handled manually
+});
+
+const commonPlugins = getPluginsList({});
+
+// import.meta is only allowed in modules, and modules can only be evaluated
+// synchronously. For this reason, we cannot detect import.meta support at
+// runtime. It is supported starting from 10.4, so we can check the version.
+const major = parseInt(process.versions.node, 10);
+const minor = parseInt(process.versions.node.match(/^\d+\.(\d+)/)[1], 10);
+if (major > 10 || (major === 10 && minor >= 4)) {
+  babel7OnlyPlugins.push(require.resolve("@babel/plugin-syntax-import-meta"));
+}
+// Same for top level await - it is only supported in modules. It is supported
+// from 14.3.0
+if (major > 14 || (major === 14 && minor >= 3)) {
+  babel7OnlyPlugins.push(
+    require.resolve("@babel/plugin-syntax-top-level-await")
+  );
+}
+// Similar for import attributes
+if (
+  major > 20 ||
+  (major === 20 && minor >= 10) ||
+  (major === 18 && minor >= 20)
+) {
+  babel7OnlyPlugins.push(
+    require.resolve("@babel/plugin-syntax-import-attributes")
+  );
+}
+
+module.exports = ({ version }) => ({
+  plugins: version.startsWith("7.")
+    ? babel7OnlyPlugins.concat(commonPlugins)
+    : commonPlugins,
+});