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/shared/lib/isomorphic/path.d.ts

@@ -0,0 +1 @@
+export { default } from 'path'

frontend/node_modules/next/dist/shared/lib/isomorphic/path.js

@@ -0,0 +1,14 @@
+/**
+ * This module is for next.js server internal usage of path module.
+ * It will use native path module for nodejs runtime.
+ * It will use path-browserify polyfill for edge runtime.
+ */ "use strict";
+let path;
+if (process.env.NEXT_RUNTIME === "edge") {
+    path = require("next/dist/compiled/path-browserify");
+} else {
+    path = require("path");
+}
+module.exports = path;
+
+//# sourceMappingURL=path.js.map

frontend/node_modules/next/dist/shared/lib/isomorphic/path.js.map

@@ -0,0 +1 @@
+{"version":3,"sources":["../../../../src/shared/lib/isomorphic/path.js"],"names":["path","process","env","NEXT_RUNTIME","require","module","exports"],"mappings":"AAAA;;;;CAIC;AACD,IAAIA;AAEJ,IAAIC,QAAQC,GAAG,CAACC,YAAY,KAAK,QAAQ;IACvCH,OAAOI,QAAQ;AACjB,OAAO;IACLJ,OAAOI,QAAQ;AACjB;AAEAC,OAAOC,OAAO,GAAGN"}