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/char-regex/README.md

@@ -0,0 +1,27 @@
+# Char Regex [![Travis CI Build Status](https://img.shields.io/travis/com/Richienb/char-regex/master.svg?style=for-the-badge)](https://travis-ci.com/Richienb/char-regex)
+
+A regex to match any full character, considering weird character ranges. Tested on every single emoji and unicode character. Based on the Lodash implementation.
+
+[![NPM Badge](https://nodei.co/npm/char-regex.png)](https://npmjs.com/package/char-regex)
+
+## Install
+
+```sh
+npm install char-regex
+```
+
+## Usage
+
+```js
+const charRegex = require("char-regex");
+
+"❤️👊🏽".match(/./);
+//=> ["", "", "", "", "", "", ""]
+
+"❤️👊🏽".match(charRegex());
+//=> ["❤️", "👊🏽"]
+```
+
+## API
+
+### charRegex()