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/postcss-selector-parser/dist/util/index.js

@@ -0,0 +1,13 @@
+"use strict";
+
+exports.__esModule = true;
+exports.unesc = exports.stripComments = exports.getProp = exports.ensureObject = void 0;
+var _unesc = _interopRequireDefault(require("./unesc"));
+exports.unesc = _unesc["default"];
+var _getProp = _interopRequireDefault(require("./getProp"));
+exports.getProp = _getProp["default"];
+var _ensureObject = _interopRequireDefault(require("./ensureObject"));
+exports.ensureObject = _ensureObject["default"];
+var _stripComments = _interopRequireDefault(require("./stripComments"));
+exports.stripComments = _stripComments["default"];
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }