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/mini-css-extract-plugin/cjs.js

@@ -0,0 +1 @@
+(()=>{"use strict";var e={110:(e,r,_)=>{e.exports=_(717)["default"]},717:e=>{e.exports=require("./index.js")}};var r={};function __nccwpck_require__(_){var t=r[_];if(t!==undefined){return t.exports}var a=r[_]={exports:{}};var i=true;try{e[_](a,a.exports,__nccwpck_require__);i=false}finally{if(i)delete r[_]}return a.exports}if(typeof __nccwpck_require__!=="undefined")__nccwpck_require__.ab=__dirname+"/";var _=__nccwpck_require__(110);module.exports=_})();