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/shared/lib/utils/warn-once.js

@@ -0,0 +1,13 @@
+let warnOnce = (_)=>{};
+if (process.env.NODE_ENV !== "production") {
+    const warnings = new Set();
+    warnOnce = (msg)=>{
+        if (!warnings.has(msg)) {
+            console.warn(msg);
+        }
+        warnings.add(msg);
+    };
+}
+export { warnOnce };
+
+//# sourceMappingURL=warn-once.js.map

frontend/node_modules/next/dist/esm/shared/lib/utils/warn-once.js.map

@@ -0,0 +1 @@
+{"version":3,"sources":["../../../../src/shared/lib/utils/warn-once.ts"],"names":["warnOnce","_","process","env","NODE_ENV","warnings","Set","msg","has","console","warn","add"],"mappings":"AAAA,IAAIA,WAAW,CAACC,KAAe;AAC/B,IAAIC,QAAQC,GAAG,CAACC,QAAQ,KAAK,cAAc;IACzC,MAAMC,WAAW,IAAIC;IACrBN,WAAW,CAACO;QACV,IAAI,CAACF,SAASG,GAAG,CAACD,MAAM;YACtBE,QAAQC,IAAI,CAACH;QACf;QACAF,SAASM,GAAG,CAACJ;IACf;AACF;AAEA,SAASP,QAAQ,GAAE"}