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/compiled/os-browserify/browser.js

@@ -0,0 +1 @@
+(function(){if(typeof __nccwpck_require__!=="undefined")__nccwpck_require__.ab=__dirname+"/";var n={};!function(){var e=n;e.endianness=function(){return"LE"};e.hostname=function(){if(typeof location!=="undefined"){return location.hostname}else return""};e.loadavg=function(){return[]};e.uptime=function(){return 0};e.freemem=function(){return Number.MAX_VALUE};e.totalmem=function(){return Number.MAX_VALUE};e.cpus=function(){return[]};e.type=function(){return"Browser"};e.release=function(){if(typeof navigator!=="undefined"){return navigator.appVersion}return""};e.networkInterfaces=e.getNetworkInterfaces=function(){return{}};e.arch=function(){return"javascript"};e.platform=function(){return"browser"};e.tmpdir=e.tmpDir=function(){return"/tmp"};e.EOL="\n";e.homedir=function(){return"/"}}();module.exports=n})();