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/pure-rand/lib/distribution/UnsafeUniformArrayIntDistribution.js

@@ -0,0 +1,12 @@
+"use strict";
+exports.__esModule = true;
+exports.unsafeUniformArrayIntDistribution = void 0;
+var ArrayInt_1 = require("./internals/ArrayInt");
+var UnsafeUniformArrayIntDistributionInternal_1 = require("./internals/UnsafeUniformArrayIntDistributionInternal");
+function unsafeUniformArrayIntDistribution(from, to, rng) {
+    var rangeSize = (0, ArrayInt_1.trimArrayIntInplace)((0, ArrayInt_1.addOneToPositiveArrayInt)((0, ArrayInt_1.substractArrayIntToNew)(to, from)));
+    var emptyArrayIntData = rangeSize.data.slice(0);
+    var g = (0, UnsafeUniformArrayIntDistributionInternal_1.unsafeUniformArrayIntDistributionInternal)(emptyArrayIntData, rangeSize.data, rng);
+    return (0, ArrayInt_1.trimArrayIntInplace)((0, ArrayInt_1.addArrayIntToNew)({ sign: 1, data: g }, from));
+}
+exports.unsafeUniformArrayIntDistribution = unsafeUniformArrayIntDistribution;