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/istanbul-reports/README.md

@@ -0,0 +1,12 @@
+# istanbul-reports
+
+[![Build Status](https://travis-ci.org/istanbuljs/istanbul-reports.svg?branch=main)](https://travis-ci.org/istanbuljs/istanbul-reports)
+
+-   node.getRelativeName
+
+-   context.getSource(filePath)
+-   context.classForPercent(type, percent)
+-   context.console.colorize(str, class)
+-   context.writer
+-   context.console.write
+-   context.console.println