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/next/dist/esm/server/node-polyfill-crypto.js

@@ -0,0 +1,19 @@
+// Polyfill crypto() in the Node.js environment
+if (!global.crypto) {
+    let webcrypto;
+    Object.defineProperty(global, "crypto", {
+        enumerable: false,
+        configurable: true,
+        get () {
+            if (!webcrypto) {
+                webcrypto = require("node:crypto").webcrypto;
+            }
+            return webcrypto;
+        },
+        set (value) {
+            webcrypto = value;
+        }
+    });
+}
+
+//# sourceMappingURL=node-polyfill-crypto.js.map