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/pretty-format/build/plugins/ReactTestComponent.js

@@ -0,0 +1,79 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.test = exports.serialize = exports.default = void 0;
+
+var _markup = require('./lib/markup');
+
+var global = (function () {
+  if (typeof globalThis !== 'undefined') {
+    return globalThis;
+  } else if (typeof global !== 'undefined') {
+    return global;
+  } else if (typeof self !== 'undefined') {
+    return self;
+  } else if (typeof window !== 'undefined') {
+    return window;
+  } else {
+    return Function('return this')();
+  }
+})();
+
+var Symbol = global['jest-symbol-do-not-touch'] || global.Symbol;
+const testSymbol =
+  typeof Symbol === 'function' && Symbol.for
+    ? Symbol.for('react.test.json')
+    : 0xea71357;
+
+const getPropKeys = object => {
+  const {props} = object;
+  return props
+    ? Object.keys(props)
+        .filter(key => props[key] !== undefined)
+        .sort()
+    : [];
+};
+
+const serialize = (object, config, indentation, depth, refs, printer) =>
+  ++depth > config.maxDepth
+    ? (0, _markup.printElementAsLeaf)(object.type, config)
+    : (0, _markup.printElement)(
+        object.type,
+        object.props
+          ? (0, _markup.printProps)(
+              getPropKeys(object),
+              object.props,
+              config,
+              indentation + config.indent,
+              depth,
+              refs,
+              printer
+            )
+          : '',
+        object.children
+          ? (0, _markup.printChildren)(
+              object.children,
+              config,
+              indentation + config.indent,
+              depth,
+              refs,
+              printer
+            )
+          : '',
+        config,
+        indentation
+      );
+
+exports.serialize = serialize;
+
+const test = val => val && val.$$typeof === testSymbol;
+
+exports.test = test;
+const plugin = {
+  serialize,
+  test
+};
+var _default = plugin;
+exports.default = _default;